Five potential Facebook killers
And three sites crushed by Facebook that are hoping for a rebirth
By Julie Sartain | Network World US | Published: 16:00, 12 July 2011
The social networking scene is constantly in flux. Facebook is at the top of the heap right now, but challengers are springing up all the time, hoping to ride the next big wave into a lucrative IPO. Here are five social media sites that are creating a buzz.