Gina Hartman has developed a wiki, Twitter4TeachersWiki, that lists people based on teaching content area or teaching level. This is an easy way to find teachers with similar interests so that you can follow them on Twitter. You can also add your Twitter name to the list with your interests to help people find you to follow.
Gina states the purpose of the wiki as: “This wiki was created to easily help educators find other educators on Twitter that have the same interests as them (that teach in the same content area). Check out the list of educators on the pages linked … and add your Twitter name to the appropriate list too.“