Raptr, a new online social gaming startup founded by Xfire co-founder and professional gamer Dennis Fong, is launching tonight and had received $12 million in its first round of funding. The round was led by Accel Partners and the Founders Fund. The service is a small download that then plugs into other games across multiple platforms including PC, Mac, Xbox Live, Facebook and Flash, and some of the games on Wii and PS3. As for the social aspects, people can track themselves and their friends’ real-time game play via social networking services like Facebook, Twitter, and FriendFeed.

Xfire was sold to to MTV Networks (NYSE: VIA) for $110 million about three years ago. Fong left and started Raptr last year.