This document contains lecture notes about online social networks and digital communication. It discusses how social networks allow users to have public profiles and connect with others. It also examines how digital media may enhance civic engagement and political participation rather than isolate users. The document then explores how information shared online can unite people and spread ideas. It analyzes how digital communication has changed the structures of publishing content and dialogue. Historical shifts from oral to written cultures and the impacts of the printing press on disseminating information are also reviewed. The document positions the current era as the late age of print and questions skepticism around new communication technologies.