Tina Fey tells Craig Ferguson why she’s holding out on Twitter, questions his @CraigyFerg Tweets

Tina Fey's promotional blitz for her new book, Bossypants, took her to Late Late Show with Craig Ferguson last night.

And if you still think you're following Fey on Twitter, then this should put a stop to that. She's not on Twitter. Never has been. She explains why. Roll the clip!