I don't think this could ever actually work. If you've already lost 2 followers, then your tweet is already out there in the timelines of your followers. Those

I don't think this could ever actually work. If you've already lost 2 followers, then your tweet is already out there in the timelines of your followers. Those who are going to see it, probably already have. Those who aren't, probably weren't paying attention and never will anyway. There are already services that tell you what you said that made people unfollow you -- so you can delete tweet manually or modify your tweeting behavior (services like: http://www.tweeteffect.com/ http://www.tweeteffect.com/ and http://twitterless.com/ http://twitterless.com/ ) Twitter couldn't remove it from timelines until people refresh, and I'm not sure if third-party clients cache tweets, but if they do, then you'd never get your problem tweet deleted from those timelines either. I guess this feature could somehow block people from retweeting your tweet? Maybe... I suppose. But, uh, most people don't retweet things that made them want to unfollow you. So that would be a silly feature. What Twitter SHOULD do, instead, is fix their delete function, which leaves deleted tweets in Twitter search. Or provide a quick edit function (i.e., editing available for 90 seconds after tweeting) so people could fix typos.