Investigating the Impact of Ad Characteristics on Social Media Ad Effectiveness in Egypt: Online Customer Engagement as a Mediator Journal title: International Journal of Social Science And Human Research Authors: Mohamed Abdelazim Abo El-Naga, Marwa Tarek Abd El Azeem, Rana Wagdi Abdel-moneam Subject(s): Economics, Humanities, Law, Social Sciences, Literature, Sociology of Education, Criminology, Public Administration