Social media allows for interactions between people through virtual communities and networks. The top social media platforms are Facebook with over 1 billion users and Twitter with 500 million users. Social media can be classified as space-timers which are location and time sensitive, space-locators which are only location sensitive, or quick-timers and slow-timers which are only time sensitive. Popular social media users include Julian Assange, Amanda Palmer, Lady Gaga, Psy, Justin Bieber, and Shashi Tharoor. On average, people discuss themselves 40% of the time in real life but 80% of the time on social media profiles. Both positive impacts like activism campaigns and negative impacts like internet addiction clinics have resulted from social media use.