If you want to reach out to high school and college students, then social networking sites are some of the best tools for the job. Nonprofit organizations are increasingly taking advantage of free social networking sites to manage and grow their networks, build a base, and reach a broader coalition. In fact, social networking sites are growing in popularity with an ever-widening demographic.

Sites such as Facebook and Myspace are free websites that allow people to share information and find organizations and individuals with similar interests. Typically, these contacts are referred to as your “friends.”

TweetBook

Login with your username and it will export all past tweets into a PDF book.

http://tweetbook.in/

TwitterCounter

Graphs out the number of followers you have.  Gives code for the "### Followers" buttons

http://twittercounter.com/

GeoFollow

Directory of where different Twitter-ers are from.

http://geofollow.com/

MyTwitterDirectory

Huge Directory of Twitter users by category of interest

http://mytwitterdirectory.com/