There's a new app that uses Watson to scour social media time-lines and identify potentially racist, sexist or just general douche-baggery and flag it for you to delete. From ThinkProgress:
So maybe it’s good that Noah didn’t delete those tweets, and that there wasn’t an app like Clear to make it easier to erase them from the record. Maybe it was important for us to see Noah’s unflattering past, considering he is inheriting a position of tremendous influence, if not technical “news” authority (though to suggest The Daily Show is “just” a comedy show is to be willfully ignorant of what that institution has become under Stewart’s leadership).
I'm not sure if this new trend of being a temporary asshole is good. On the one hand, I don't think 140 characters should be empowered to ruin anyone's life, but on the other hand, I think consequences make the human race better in the long run.