Social media refers to virtual communities and networks where people interact and share information. Popular social media tools include Facebook, Twitter, Instagram, WhatsApp, and YouTube. The founders of these major sites include Mark Zuckerberg, Larry Page, Sergey Brin, and Elon Musk. While social media can cause addiction, reduced physical activity, and health issues, it also makes connecting with others easier, allows for quick sharing of information, and can benefit business strategies and education.