Wikis, Twitters, and Social networking for teachers on the web

Just surfing around & found a few interesting links:

This wiki describes how teachers can use technology for social networking: Socialnetworking4teachers

This wiki is for new teachers new-teacher-resources.wikispaces.com

Here is a link to an article that lists the "top 100 Edu-Twitters"

This site helps schools to network with each other:

www.theschoolsunited.com