Both DanceArt.com and BalletAlert.com are very actively and carefully monitored. The folks who operate the messageboards are extremely strict about topics that they deem inappropriate. Messages that cross the line will be deleted before anyone else can read them.
The "line" is not clear, but, in general, it's anything that could possibly upset a parent.
You can also try www.criticaldance.com, which has private messageboards for young dancers. The messageboards there are also monitored, but, because the private boards are off-limits to any adults but the monitors, the discussions may not be as heavily censored as the ones on the public boards. [/i]