Web 2.0 concerns and work-arounds

I've posted before on how do we handle CIPA Compliance, especially in districts that are really strict in that regard such as mine, but now I have another question...

Are there any specific Web 2.0 apps that require the approval of a moderator/administrator/teacher before it gets posted online?

For example I was looking at using WikiSpaces or Diigo w/ my students/teachers, but realized you can't set it to moderate their posts before it goes up online.

In this district I have to make sure that anything that gets posted online by a student can not contain swear words/bullying, etc. While we do have a filter and use an application called Airistotle which will alert "us" of swearing, it does not stop it from happening.

My question is how do other districts handle this. If there isn't something like that, that allows students to post whatever they want before a moderator/teacher notices something "bad" is up online before they remove it.

I know students have to be responsible for their actions and we can't protect them from everything, but this district wants to do all it can to "protect" them so they don't have to worry about any backlash from parents, and this is causing a bunch of "roadblocks" for me when I try to find ways to incorporate Web 2.0 technologies.

Any thoughts would be appreciated.

PS, we are going the route of Gaggle.net so we can use filtered email/blogging/discussion boards, but I want to start using the really "cool" stuff!!!