Imbee ... Safe social networking?

Does anyone out their use imbee?  I'm looking into changing the way we give our children email & blog access and trying to give them a space that they can make their own on the web while making sure we have a safe space that doesn't require a whole lot of teacher monitoring. 

Imbee struck me as being a little commercial but I'm open to ideas has anyone else used it? 

Thoughts please..