Social network for teachers using web 2.0 resources

This site

http://www.classroom20.com/

is a social network for those interested in using web 2.0 resources in schools. I don't currently feel like I have time for an online social network. I doubt that this is the most efficient way to learn, even though it says it strives to be beginner-friendly. It might be good for being inspired -- maybe I'll join it later if I do my creative sharing project on project-based learning. (Or, maybe not.)