anallawalla - 1:03 pm on Nov 21, 2010 (gmt 0)
Qwitter (useqwitter.com) used to email you which tweets caused people to stop following you. I signed up for the paid version ($4.99/yr) but didn't notice any change in the information sent to me and then it no longer sent the particular tweet when it told you who had unfollowed you.
I haven't heard from the site for a while and when I checked it now, it can only show my tweet from 11 October backwards, i.e. no recent tweets. Even the count of my followers/following is not accurate. Don't know what's up.