Social media refers to online platforms that allow users to connect, share content, and interact. Popular social media tools include Facebook, Twitter, Instagram, YouTube, and Whatsapp. Founders of these sites include Mark Zuckerberg of Facebook, Jack Dorsey of Twitter, and Jan Koum and Brian Acton of Whatsapp. In 2016, Facebook had over 1.6 billion users, YouTube had 1 billion, and Instagram and LinkedIn each had over 400 million. While social media allows connection and information sharing, overuse can be distracting and lead to addiction, privacy issues, cyberbullying, and impacts on mental and physical health.