... Impressions(Geddes, 2014;Google, 2021b;Zenetti et al., 2014); • Traffic volume (Moral et al., 2014); • Number of pages per visit (Moral et al., 2014); • Average visit time (Moral et al., 2014); • Bounce Rate (Moral et al., 2014; Sculley et al., 2009); • Return rate (Lu & Zhao, 2014; Moral et al., 2014); • Lifetime value of the customer (Geddes, 2014; Google, 2021b; Lu & Zhao, 2014; Smith, 2002); • Click through rate (Barry & Charleton, 2009; Geddes, 2014; Google, 2021b; Jansen & Clarke, 2017; Jansen et al., 2009, 2013; Kim et al., 2014; Lu & Zhao, 2014; Sculley et al., 2009; Zenetti et al., 2014); • Conversion rate(Barry & Charleton, 2009;Geddes, 2014;Google, 2021b;Jansen & Clarke, 2017;Jansen et al., 2013;Lu & Zhao, 2014;McDonald, 2014;Rutz & Bucklin, 2007;Zenetti et al., 2014); • Return on investment(Alby & Funk, 2011;Barry & Charleton, 2009;Geddes, 2014;Google, 2021b;Jansen et al., 2013; Kim et al., 2014;Lu & Zhao, 2014). ...