First successful book-to-Twitter adaptation

SHIT MY DAD SAYS became a book. Now Virginia Heffernan and Mike Albo's THE UNDERMINER is a very funny/horrifying Twitter feed. I think the authors are involved (judging by some tweets that have been flying back and forth about it) but I suppose it's possible it could be an ardent fan who just nails the tone of that person who consistently cuts you down over everything under the guise of... well, not doing so, I guess.