In the past, we wrote about Qwitter, a service that alerts you when people stop following you on Twitter. But it seems this service has stopped working as it didn’t send me any email notifications for a long time. So, here is a nice and working alternative:
TwUnfollow is a free service that notifies you about Twitter followers who are no longer following you. 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 a daily summary of Twitterers who unfollowed you. TwUnfollow also shows the history of those who followed or unfollowed you recently.