This book examines users’ digital content contribution and consumption behavior from a social perspective. Digital content is everywhere—from search results on search engines to posts on social media. Incentivizing users to contribute abundant content and motivating users to engage in and pay for digital content are vital for online platforms, especially those relying on digital content generated by users. This book develops a theoretical framework to incorporate social influence, including social presence, social interaction, social comparison, social loafing, and social...