GameGround is a lightweight app that adds an interactive layer to games across different platforms by tracking a player's scores, offering badges and connecting them with friends. It recently raised $5.3 million dollars from Sequoia Capital, Softbank Capital, Vodafone Ventures and Novel TMT Ventures.
Oberon Media does it all -- online gaming, mobile gaming, desktop gaming, Facebook gaming, from poker to games with storylines. The company is expanding, having just raised $16 million from undisclosed investors in November.
4mm was founded in 2009 by a small cast of video game allstars, including Rockstar Games co-founders Jamie King and Gary Foreman. 4mm produced the high profile karaoke game Def Jam Rapstar and recently announced it's partnering with NBC for a Facebook game.
Arkadium's first Facebook game, Mahjongg Dimensions, got a million users in 60 days. Since then, Arkadium has released four games and hit 2.5 million active users in October. That's not as high as it had hoped, but the company plans to roll out three more games before the end of the year.
Vostu is one of the leading social gaming companies in Brazil, and recently closed a $30 million round of funding, giving it a valuation of $300 million. [Disclosure: Joshua Kushner is a co-founder of Vostul. His brother Jared owns The Observer.]