Raptr is a new social network that launched today which focuses on gamers. I’ve had a quick play around with it, and I’m actually very impressed. The services tracks your Xbox Live, PS3 and Wii gaming, as well as Steam, Guitar Hero, XFire, and World of Warcraft on the PC. When someone in your friends list starts a game on any of those services, an alert pops up and you can jump right in and join them…