Hey, I like the minimal look of your app. I'm not a gamer so my comments might be a bit off, so adjust accordingly :)

I don't like "social networking site" because it sounds too technical/formal?

C) Noobindex is a place for gamers to meet, join forces, and to (plan/interact/communicate)?

edit: Upon further review. Once landing on your homepage, I don't really know what my next step would be. I know you have the register/login links in your nav, but beyond that, I don't know why I would register.

Also for "find a group" and "find a user" you should list out the groups and users so people could browse and explore on their own. What you have currently is like a blank restaurant menu. I don't know what I'm ordering because I don't know what you serve?