Main post link -> http://mathfights.com/
There is a relatively new site for practicing math problems. You compete real-time against other mathfighters. If any of you have an Art of Problem Solving account, it is similar to FTW (although if you have an AoPS account then chances are you have heard of this before I post this discussion) If you want to join, then just go to mathfights.com and sign up. It's a great place to practice your speed and problem solving skills under pressure of time.
A note: the people you play in the early divisions may seem like robots but they are real. Just a bit slow for the likes of us.
EDIT: If you have a Google+ account, you can find the official community here:
Also, here is the official Facebook page. https://www.facebook.com/mathfights
EDIT2: Thank you everyone for the great feedback on this site! And thanks for joining!