Another site has come to light that tells you when followers, well stop following, plus some more tools! It is called Twitterless and has you simply follow their name on Twitter and enter your own on their site.
Twitterless will notify you when somebody stops following you and tell you who it is and your follower history is graphed out over time. Find out why you’re losing or gaining followers.
Now what was cool is that they have additional maps to see where your followers are, you can search and filter through thier postings. You can even set an auto-follow when the person following you has XX number of followers.
Filed under: Add-on Tools, Twitterless