Credit: Mark J. Terrill/AP Images

Image Credit: Mark J. Terrill/AP ImagesSet yourkeith clock's alarms for 8 p.m. ET tonight, Olbermaniacs. At that precise time, your fearless leader will tweet … something monumental. I know this because Olbermann pre-tweeted that tweet with another tweet: "At exactly 8 Eastern tonight I will issue my first tweet. Well, other than THIS one :)."

What will he say — in 140 characters or less? Will he clarify his reasons for leaving MSNBC? Will he discuss his future? Will he respond to Glenn Beck, who today called his rival "the biggest pain in the a– in the world." Who knows? Can you feel the excitement building? I'm so wired, that this PopWatch post is really just to announce my 8:01 p.m. post-Olbermann-tweet PopWatch post.

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