WackWall is a service that anyone can use to create a social network. Some of WackWall’s key features are message boards, customizable user profiles, private messaging between community members, and Facebook connect integration.If you’re looking to create a small network in which you can share information and interact with your students and their parents, WackWall might be for you.
http://www.freetech4teachers.com/2010/08/wackwall-build-your-own-social-network.html