In past we wrote about Qwitter, a service which alerts you when people stop following you on twitter. But it seems that this service has stopped working as it didn’t sent me any email notifications since long time. So, here is a nice and working alternative:
TwUnfollow is a free service which notifies you about Twitter followers that are not following you any longer. At the moment it checks the followers about four to five times a day. The service accesses your twitter account using OAuth. It sends email notifications instantly or as daily summary of twitterers that unfollowed you. TwUnfollow also shows the history of those who followed or unfollowed you recently.