If you want to see which Twitter lists you might be on then check in here with your username. You will then be given a tag cloud indicative of which lists you are on. Clicking on the tags highlights and links to the lists you are on.
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 below and add your Twitter name to the appropriate list too.