I'm here to announce the release of MathMash!
It's a Math contest platform pretty similar to Codeforces in contest structure. Each user is given an initial rating of
1000 and it's updated after the end of a contest that the user participated in, based on his rank in the contest. It also has a community which I put a lot of effort into. The community is made up of mini communities: Any user can create his own forum, add admins and start a community himself.
I also tried to add some facebook flavor to the site. You can make friends or follow other users. Whenever any of your friends posts or comments anything or someone upvotes your post/comment you'll get notifications.
I posted about the basic functionalities of the site in this MathMash post.
You're all invited to join the contest. Hopefully we will fun!