The document summarizes various legal issues that can arise from social media use including defamation, privacy, copyright, and trademarks. It discusses the elements of defamation claims and available defenses. It also outlines principles around misuse of private information, balancing privacy rights with freedom of expression. The document then discusses copyright basics and infringement issues as well as an overview of trademark law. It concludes by addressing specific online legal issues like takedown notices, territorial jurisdiction concerns, and strategies for responding to takedown requests.