Micro-Blogging:
I am a follower of Top Education Tweets on Twitter
Example:
How one superintendent is using #**socialmedia** to communicate with students, parents, and the community http://ow.ly/4ExkV cc: @**canyonsdave**

Blogs or other writing sites which include commentary:
I found this blog by a high school math teacher with lots of interesting ideas I plan to try in class.
http://sweeneymath.blogspot.com/

Wikis and File Sharing
I joined a Wiki called Mathfest (http://mathfest.wikispaces.com/) which contains several links to other on-line resources.

Professional Networking
I joined the group Math, Math Education, Math Culture on LinkedIn, which has several discussions about current topics and trends in math education.

Social Networking
I have a Facebook account, and I belong to a group with other students from my ____Social Media and Instructional__ Strategies course__. I hope to maintain contact with them to share ideas for effective uses of social media in education.

Social Bookmarking
I am a member of Delicious.com. I searched for stacks related to Math Education and Swimming, and found some useful bookmarks.