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Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 183
Available Online at www.ijcsmc.com
International Journal of Computer Science and Mobile Computing
A Monthly Journal of Computer Science and Information Technology
ISSN 2320–088X
IJCSMC, Vol. 5, Issue. 1, January 2016, pg.183 – 190
The Impact of Digital Communication
on Social Networks: A Review
Abstract— The growing of demand for the huge data transmission made the digital communication systems
increasingly attractive, greatest of communications have become digital due to the advantages of digital
communication over analog communication. The advantages of digital communication are helped to develop the
social networks during the years to the modern-era diversity which uses digital media. The researchers in this paper
were eager to review how digital communication led to the emergence of social networks by review the history of
digital communication, social networks. Also, this paper discussed some facts and statistics about some popular social
networks.
Keywords: Digital communication, error protection, social network, Mobile Networking, WWW, Satellite
communication
1. Digital communication
1.1 Introduction
The growing of demand for the huge data transmission made the digital communication systems increasingly attractive.
Digital transmission proposed data processing option flexibilities not available with analog transmission. The great
demand for voice (VOIP), Data and internet connections is the motived power behind the growth in telecommunication.
The fastest growing area in communication engineering is the design and manufacturing of hardware and software for
digital communication networks [1] .
Greatest of communications have become digital due to the advantages of digital communication over analog
communication. Digital communication is robust in the sense of invulnerable to channel noise and distortion.
Regenerative repeaters along the transmission route can detect a digital signal and refresh the transmitted signal and
retransmit a new noise-free signal. This prevents the noise to accumulate along the path. Digital signals can be coded to
produce extremely low error rates and high fidelity [2].
The subject of digital communication involves the transmission of information in digital form from a source that
generates the information to one or more destination. Knowledge of basic rules of operation of digital communication
system is crucial factor in understanding contemporary communication. Digital communication systems can be treated as
a medium for many different systems and services. Digital TV, cellular telephony or internet access are only three
prominent examples of such services. Basically, each kind of communication between human beings and between
Ahmed Mohammed Ahmed
Dept. Of Communication
Engineering, University of Diyala,
Ahmed_zydi@yahoo.com
Hazim Noman Abed
Dept. Of Computer Science,
University of Diyala,
Hazim_numan@yahoo.com
Noor Hasan Hassoon
Dept. Of Computer Science,
University of Diyala,
Noorh_85@yahoo.com
Ahmed Luay Ahmed
Ministry of Higher
education
Ahmed.qacc@gmail.com
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 184
computers requires a certain kind of transmission of digital represented messages from one location to another or,
alternatively, from one time instant to another, as it is in the case of digital storage [3].
1.2 History of digital communication
Telegraph
The telegraph was achieved by Samuel Morse. With few words transmitted by Morse’s electric telegraph between
Washington, D.C., and Baltimore, Maryland, in 1844, an entirely revolutionary means of real-time, long-distance
communications was started. The telegraph, ideally appropriate for manual keying, is the indication of digital
communications. Explicitly, the Morse code is a variable-length code utilizing an alphabet of four symbols: a dot, a dash,
a letter space, and a word space; short sequences represent frequent letters, whereas long sequences represent infrequent
letters [4].
Telephone
The telephone was invented by Alexander Graham Bell in 1875. Real-time transmission of speech made up with
telephone by encoding the electrical signal and replication of sound a practical reality. The original version of the
telephone was simple and weak; enabling users to talk over short distances only. Especially, in 1897, A. B. Strowger, and
mortician from Kansas City, Missouri, invented the automatic step-by-step switch that bears his name. Over all the
electromechanical switches invented over the years, the Strowger switch was the most popular and commonly used.
Harry Nyquist, 1928, published his classical paper on the theory of signal transmission in telegraphy. In particular,
Nyquist established criteria for the accurate reception of telegraph signals transmitted over dispersive channels in the
absence of noise. Much of Nyquist’s early work was applied later to the transmission of digital data over dispersive
channels [5].
Alex Reeves invented the pulse-code modulation PCM technique in 1937, PCM technique means encoding digitally the
speech signals. In the World War II, the PCM technique was developed to make the encryption of speech signals is
possible; actually, a full-scale, 24-channel system was exploited in the field by the US military at the end of world war.
However, PCM technique had qualitative change with the innovation of the transistor and the development of large-scale
integration of circuits for its commercial utilization. In 1948 Claude E. Shannon published his entitled paper “A
Mathematical Theory of Communication” [6].
This was the foundation of the digital communication. Shannon has presented that a communication system can be
considered to be digital, without loss of optimality and can be divided the transmission system into two parts, Source
coding and Channel coding. It is significant that prior to the published paper of Shannon’s, it was considered that
increasing the rate of data transmission over a noisy channel would increase the probability of error. The communication
theory community was taken by surprise when Shannon shown that this was not correct, provided the data transmission
rate was below the channel capacity [6].
1.3 Error protection
Basically, in the communication systems, the data are transmitted as a series of binary bits, which are modulated to
analog signal and transmitted over a communication channel. Though, these bits might corrupt in the noisy channel and
might get interference through transmission over the communication channel. At the receiver, the received signal will be
demodulated into binary bits [7]. Throughout the transmission, possibly bits error might occur depending on the
characteristics of the channel, and the number of bit error depends on the amount of noise in the communication channel.
Such errors, naturally occur after the signals transmission, storage, or processing of information in digital form. Error
control coding enables the processes of detection and correction which leads to protect the transmitted digital information
from those errors may have occurred. Error-control code techniques are now applied in almost the entire range of
information communication, storage and processing systems. Industrial development advances in electronic and optical
devices have aided the implementation of very powerful codes with close to optimal performance. Furthermore, new
kinds of code, and new decoding methods, have recently been developed and are starting to be applied [8].
One of the expectations made in the Shannon’s channel coding theorem is more sophisticated coding technique applied to
the system can convert a noisy channel (unreliable transmission) into an error-free channel (reliable transmission) [9].
Validation of the theorem about the possibility of having error-free transmission is done by applying a coding technique
of a random nature [10]. In digital communications, there are two main techniques of error-control structures: Automatic
Repeat re-Quest (ARQ), which are commonly utilized in wire line communication systems, and Forward-Error
Correction (FEC) schemes, also known as channel coding, which are applied in the wireless systems [11]. The automatic
repeat request (ARQ) combines the error detection and retransmission, to get accurate provides of data, even though the
occurrence of errors during transmission. On the other hand the FEC efforts to correct errors at the receiver, by applying
the techniques of error control coding designed for that purpose. There are basically two procedures for adding
redundancy, related to error-control coding techniques [5a], firstly, block coding and the second is convolutional coding.
In past decade, for the practical standard digital communication the source encoder and decoder, channel encoder and
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 185
decoder, and modulation-demodulation has been designed independently. More explicitly, the source encoder and
decoder have been designed without knowledge about the statistical channel encoder and decoder [12]. In 1979, the idea
of jointly designing the source-channel coding, begun with the work of [13]. It has been reported that, in noisy channels
the design of joint source-channel encoder and decoder can improve the performance dramatically.
Digital communications devices and techniques have been around for ages. The 1980’s popularization of the computer
and the birth of the Internet was a quantum shift in field of communication and an evolutionary step for human society.
The Digital Revolution marked the final phase of the information age. People in far parts of the world not connect
immediately and information flow has shrunk the world. One of the biggest changes recently is the interconnected
immediacy of social networking. Digital communication has led to invent the social networking by three important
applications of digital which represented by: the internet- World Wide Web (WWW), mobile communication, and
satellite communication [14].
1. Internet- World Wide Web (WWW)
• The World Wide Web or WWW, is an information service that is on the Internet. It is an attempt to organize the
Internet so you can find information easier moving threw document to document. If you know how to utilize the
Net, in just five minutes you could send and receive information and comments with millions of people all over
the world, get a fast answer to any question, computing, technical, business, investment, or any other subject
[15].
• People in all kinds of businesses and industries are sharing a wide spectrum of educational, business, and
personal interest on the Net. Many people learned English language by using internet. A growing number of
companies are generating substantial sales of their products, but the Internet is not just for academics, business,
and professional use. It could also be really fun [15].
2. Mobile communication network
• Mobile networks are providing voice and data connectivity that can improve billions of lives. They are helping
to boost local economies, deliver important social services like healthcare and education, improve democracy
and generally raise standards of living. They are cheaper and easier to use, they don’t need a regular power
supply and can be used by people who don’t have a previous experience of technology [16].
3. Satellite communication
• Since the beginnings of the long distance telephone network, there has been a need to connect the
telecommunications networks of one country to another. This has been accomplished in several ways.
Submarine cables have been used most frequently. However, there are many occasions where a large long
distance carrier will choose to establish a satellite based link to connect to transoceanic points, geographically
remote areas or poor countries that have little communications infrastructure. Groups like the international
satellite consortium Intelsat have fulfilled much of the world's need for this type of service. They are used for
mobile applications such as communication to ships, vehicles, planes, hand-held terminals and for TV and radio
broadcasting [17].
2. Social Networks
2.1 History
Social networks have developed during the years to the modern-era diversity which uses digital media. The social
network is not that new and it didn't start with the computer but instead the telephone. Through the 1950s, phone
phreaking, the concept used for the hustler searching of the telephone network. This procedure was completed by the use
of home-made electronic devices that facilitated unlicensed access to the telephone system to make free calls. Phreaks
were able to find telephone corporation test lines and conference circuits to achieve their task. Brett Borders stated
phreaks were able to breakthrough into company unused voice mailboxes to host the first blogs and podcasts [18][19].
Over the 1960s, the emergence of the email to the public [19]. But, the internet was not accessible to the public until
1991. The main objective of email is to transfer messages between two computers, but the both computers must be
online. Nowadays, E-mail service will accept and store messages that allow users to access e-mail in what they see fit. In
1969, ARPANET, established by Advanced Research Projects Agency (ARPA), a U.S. government agency, was
developed. ARPANET was an “early network of time-sharing computers that formed the basis of the internet.”
CompuServe, the third development of the 1960s, was also established in 1969 with a task to supply time-sharing
services by leasing time on its computers. With too high fees, this service was very expensive for many [20][21].
In recent years social networks have become very famous because of the growing affordability and spread of internet
enabled devices such as mobile device, computers and other more modern innovations such as internet tablets. This is
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 186
illustrated through the growing popularity of so many online social networks such as Facebook, Twitter, Google +,
Instagram and LinkedIn. Such as these social networks have lead to a massive explosion of centralization network data in
a wide range of scenarios. social networks can be defined either in context of site such Flickr which are designed for a
various service such as content sharing, but it also allow an wide range level of social interaction, or in the context of
system like Facebook which are explicitly design for social interactions[22].
Generally, a social network has been defined as a network of relationships and interactions, where the nodes composed of
active actors and the edges composed of the interactions or relationships between these active actors. A popularization of
the social networks idea is that of information networks, the nodes in these social networks consist either entities or
actors, and the relationships between them indicated by edges. Obviously, the social networks term is not limited to the
particular condition of an internet-based social network such as Facebook; in often the social networking problem has
been studied in the field of sociology in concepts of generic interactions between and group of active actors. With such
interactions may be in any traditional or non-traditional form, whether they be telecommunication interactions, E-mail
interactions, face to face interactions or postal mail interactions [22][23].
In general, the traditional studies on social network analysis have not concentrate on online interactions, and have
historically preceded the emergence and popularity of computers or the internet. A conventional example of this is the
study of [24] in the sixties before the innovation of the internet, who hypothesized the possibility that any pair of active
actors on the planet are separated by at six degrees of separation. Whilst such hypotheses have widely stayed conjectures
during the last decades, the online social networks development has made it possible to exam such hypotheses at least in
an online setting. This is also indicated to as small world phenomenon. This phenomenon was examined in the context of
MSN messenger data, and it was illustrated in [25] that the average track length between two MSN messenger users is
6.6. This can be considered a verification of the largely known of "six degrees of separation” in social networks. This
examples are by no means, a various collection of online data is available now which has been used to proof the fact of a
host of other conjectures such as that of preferential attachment or shrinking diameters [26]"The shrinking diameter
conjecture hypothesizes that the diameters of social networks shrink in spite of the addition of new nodes, because of an
increase in the density of the underlying edges. The preferential attachment conjecture hypothesizes that new nodes and
edges in the social networks are more likely to be attached to the dense regions of the network".
2.2 Positives and Negatives of social Networks
Relatively a social networking is new advance in technology, they are various sites that people can make personal
profiles, share their pictures, videos to their family, friends and other people from all the world. So it's easy to get carried
away with interactions and attentions you can have 24 hours per day on social networks sites, but there are many
positives or negatives of these social networks on our social life [27][28].
A. Positives of social Networks
1. The main goal of the social network is to be able to keep in touch to families and friends in today's fast-paced and
ever changing worlds.
2. Social networking is a wonderful method to finding people with common interests
3. Social networks are invaluable promotional tool. Organizations, Musicians and artists can meet an impossibly great
and varied amount of audience using social network sites. This helps them to deliver their products in a way that has
never been seen before.
4. By social network sites breaking news and other important information spreads unbelievable quickly.
5. Social networks helps to catch and convict criminals. Sometime people often do not take in their account the
consequences of what they post in their social site. Photograph of themselves when doing illegal things, or even
they bragging to share about crimes they have committed are all things that law enforcement use to persecute these
criminals. Also, they use these social sites to identify and solve existing cases.
B. Negatives of social networks
1. Social networks perpetuates false and unreliable information, within hours or days anything can diffusion to
millions of people on social networks. Unluckily, this also includes things that are not true or made up. this
information can cause scare and intense misinformation in society.
2. Social networks causing great relationships problems. Although the social networks are used to starting new
relationships, but ending many others.it is so easy to communicate and share plans or pictures with a person on
social networks and keep it completely under wraps. This new seduction have been leading wedges into people's
offline relationships, real life, oftentimes ending them for good.
3. Cyberbullying is a growing problem in social networks. Not always having access to people's lives at all times is a
good thing. A new direction of cyberbullying is wreaking destruction all across the world. This is particularly true
with young kids. They are publicly inconvenience one another, and posting defamatory things which are
broadcasted to the entire cyberbullying world.
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 187
4. Social networks are used to profile and discriminate in the job world. Everyone has a social networks account that
shows what they look like, the type of life that they live, what they look like, and how old they are. Workers are
using to their benefits is some very worrying ways. Jobs that are looking for a some standard of person, but cannot
legally express these standards, are using social networks to pre-screen their applications.
5. The addiction is real in social networks. One of the major problems with the social networks craze is that people are
becoming more and more addicted to using it. it is the first time waster at job, at home, and in school.
Four types of social networks will be briefly discussed below by the researcher in this study as follows:
Facebook
In Feb. 2004, Facebook was started as a social network site, and it is specially operated by Facebook headquarter [29].
Facebook was established by Mark Zuckerberg and his roommates when he was a student at Harvard College. In the
beginning, the site was limited only to Harvard students. Later on the access was expanded to high school students and
later to everyone that is 13 years or more. In Jan 2009, Facebook was ranked as the most used the worldwide of social
networks. In Jul 2010, more than 500 million users has joined to the Facebook [30]. In May 2010, Google declared that
the most sites in the world visited by people is Facebook. It announced that this was find out from findings on 1000
website around the world. Users in Facebook may create a user profile, add other users "friends", and interchange
message, including photos, comments, and automatically notifications. In addition, Facebook active users may
enrollment common interest user groups, organized by the work, college, school [31].
Every day, access to Facebook is in increase, it also became the top social network around 8 individual markets in Asia.
On October 2007, Microsoft declared that it had bought a 1.6% share Facebook for $240 million. Microsoft's buy
comprised rights to place international ads on Facebook; other corporations have evenly followed suit. For example, in
2010 FIFA football world cup, Nike did ads with Facebook, within minutes, an average of 8 million viewers had
registered with Facebook [32] [33].
Twitter
Twitter was existed in 2006 while Facebook started to open its doors to people. Twitter acquired a lot of saleability
because firstly it provided more different choices such as micro blogging and secondly it was used by some famous
people [34][35]. Till 2010, there was many social networks produced, such Friend Feed in 2007 and gained by Facebook
in 2009 [34]. In 2008 Ping.fm was created and defined as "the auto magic" micro blogging and networking site service
that authorize users to post to several social networks at the same time [36][37]. In 2009, Net log previously known as
Facebox and Binbox, is a Belgian social networking site was started particularly targeted at the European youth
demographic [38]. Google buzz is a social networking and message tool was launched in 2010 that integrates a web
based email program which will work via the Gmail service, will allow user to post photos, status update and links to
members of their network, in addition to drag in their activity on other website such as Facebook or Twitter [39].
Instagram
Instagram is a free mobile application was produced by Kevin Systrom and Mike Krieger in 2010. The service provided
by Instagram was quickly gained popularity, in April 2012 over 100 million users and December 2014 over 300 million
[40]. Instagram was disseminated through the Google Play, App Store, and Windows Phone Store[41]. Support for the
app is available for iPad, iPhone, iPod Touch, and Android handsets, while third party Instgaram apps are available for
Nokia-Symbain Device and Blackberry 10. the service was gained by Facebook in April 2012 for US$ 1 billion in cash
and stock. In 2013, Instgram grew by 23%, while Facebook, as the origin company, only grew by 3% [42][43].
Instagram is an online mobile video, photo sharing and social network service that authorize its user to take videos and
photos and share them on a several social networks platforms such as Twitter, Facebook. In original, a special
characteristic was that it limited photos to a square shape, similar to Kodak Onstamatic and Polaroid, on the other hand to
the 4:3 aspect ratio usually used by cameras of mobile device. Version 7.5 was released in Aug. 2015 which allowing
users to post their photos captured in any aspect ratio. Also, users can make digital filters to their photos [44] [45].
LinkedIn
LinkedIn is a business oriented social network service was originated in Dec. 2002 and started on May 5, 2003, and it is
basically used for professional networking [46]. From 2015, most of the website's income comes from selling access to
information on its users to recruiters [47]. The members of LinkedIn were Increased to 20 million in 2006 [48]. In Oct.
2015, LinkedIn reports more than 400 million gained users over 200 countries and regions [49] [50]. LinkedIn website is
available in 24 languages [51], such as German, Italian, Portuguese, Spanish, Dutch, Arabic, Chinese, and English [52]
[53]. LinkedIn has 65.6 million monthly visitors form U.S in July 2, 2013, and 178.4 million worldwide [54], the number
of user was increased to 184 million in 29 Oct. 2013 [55]. LinkedIn had 33.9 million unique visitors in June 201, up 63 %
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 188
from a year previously and overriding MySpace [56]. LinkedIn displaying to public in January 2011 and traded its first
stake on 19 May 2011, under the NYSE symbol "LNKD" [57].
The main functionality of LinkedIn authorizes users to create "profile" and "Connections" to each other which may
represent real world relationships. LinkedIn users can make invitation to anyone to become a connection even whether a
website user or not. However, if the invited person select "I don't know" or "Spam", this will be against the inviter. If the
inviter gains too many of same response, the user account may be closed or restricted [57]. Below the list connection that
can be used in various ways:
Getting introductions to the "connections of connections" which called second degree connections and
"connections to second degree connections" which called third degree connections.
Users can find Job, business opportunities suggested by someone else in one's contact network.
Business owners can search and jobs for potential candidates.
The LinkedIn can help the job seekers to review the profile of recruitment manager and find out which of their
current contacts to introduce them
To aid in identification, the users can post their photos and view photos of others
Users can follow various corporations and can receive notifications on offers available and new joining
Users can bookmark jobs that they would like to apply for
Users can "congratulate" and "like" for other's new employments and upgrade.
Users can know who has visited their profile page.
The gated access approach "(where contact with any professional requires either an existing relationship or the
intervention of a contact of theirs)" is aimed to construct trust among the service's users. LinkedIn participates in the
"EU's International Safe Harbor Privacy Principles"[58].
2.4 Social Website in 2015
The fast truth can be summarized in one term, "mobile". Penetration of Smartphone has Increased as it the device have
become more accessible and the wireless networks more quickly and everywhere. Now there are 7.2 billion people on
our earth and of those the following numbers make interesting reading [59][60].
More than 3 billion active Internet users which mean 45 percentages of the world's Internet users.
Almost 2.1 billion people have Social network account
There are 3.65 billion mobile users have access by smartphones and tablets to the Internet.
Nearly 1.7 billion people have social network active account
Figure 1: Global digital Snapshot [31]
The increase of social networks that not speaking English in Russia and China like Qzone, are producing big social
networks that override Twitter and Instagram. Below some social network's facts and statistics in 2015.
Facebook
1. There are close to 1.4 billion users on Facebook.
2. Total Facebook users are 47% of Internet users.
Ahmed Mohammed Ahmed et al, International Journal of Computer Science and Mobile Computing, Vol.5 Issue.1, January- 2016, pg. 183-190
© 2016, IJCSMC All Rights Reserved 189
3. 4.5 billion Like are generated per day.
4. Almost 75% of Facebook's income comes via mobile announcements.
5. Upload of User videos direct to Facebook now override YouTube.
Twitter
1. There are 284 million Twitter users
2. 88% of Twitter users are on mobile
3. 500 million Tweets are generated daily
Instagram
1. There are 300 million of Instagram users
2. 70 million videos and photos are sent per day
3. Instagram's users ages ranging from 18-29, which make up 53% of Internet users
LinkedIn
1. 400 million registered users on LinkedIn.
2. $643 million are total income at the end of 2014 "a growth rate of 44% over the previous period".
3. Recently, over 39 million students college graduates on LinkedIn.
Other social media and network
Facebook maybe the larger but there are many networks and other social media facts that should not be forgotten.
1. Over 200 million users on Viber.
2. In China there are 639 users of Qzone.
3. Whatsapp has 600 million users.
4. Wechat is close to 468 million users in China.
5. 500 million users on Facebook messenger.
6. 100 million monthly users on Snapchat and it has been estimated value at nearly to $20 billion at the last
evaluation.
7. 100 million users of VKontake in Russia's.
8. In 2015,$8.3 billion the income of social networks from advertising.
3. Conclusion
The overall theme of this study is how digital communication impact on social networks. This paper was discussed two
important sides, the digital communication and social network. In digital communication the authors presented overview
on the history of digital communication, error protection, Internet- World Wide Web, mobile communication system and
Digital satellite system. While in social networks the authors reviewed history of social networks, positives and negatives
of social networks and discussed four types of social networks. in the end, facts and statistics of social networks in 2015
was presented.
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