MCHammer launches DanceJam, a social-networking site for dancers. Users will be able to upload their video to show off their dance moves and be rated by the community. Other exciting features includes “dance-offs” to see who is the best of the best. Users will have the opportunity to learn to dance, get information on the latest dance events, and find out what the hottest dances are. Businessweek did an interview with him here. So if you have the moves, duke it out at DanceJam.