You're on Facebook. So is the guy sitting next to you on the bus. Your brothers, best mates, old classmates, demented neighbors, former coworkers, your grandma – they're all on Facebook. The social networking behemoth now boasts over 500 million (active) members (that's 1 in every 13 people on earth) and everything from your Mountain Dew Code Red to your sneakers has a fan page). Facebook is becoming an integral (and at times, claustrophobic) part of how we access the Internet. [Gizmodo]