FBNY has learned that 23/6, the online humor site launched in 2006, has been downsized to three staffers and has closed its offices. The site will continue as a Huffington Post vertical, to be run out of the HuffPo offices, and will use freelance pieces from the staffers who have been let go. We’re told that Sarah Bernard, former HuffPo GM and president of 23/6 is not staying on.

Huffington Post acquired 23/6 earlier this month from IAC after the company pulled its support at the end of 2008.

You don’t need us to tell you that last night was a night for celebration! Parties abounded across the city. While FBNY was twittering the night away at the CNN Grill, a number of other media types stuck to Will Leitch‘s apartment in Brooklyn. By all accounts we missed a good time at HuffPo’s big 23/6 bash (pictured NYO‘s Matt Haber and Portfolio‘s Jeff Bercovici). And for a sense of the scene on the streets check this out.

23/6 the Huffington Post off-shoot that of late has been giving the Onion a run for its money, hosted a comedy hour upstairs at the Big Tent following Hillary Clinton‘s keynote address last night. Featured performers included Portfolio‘s Matt Cooper (who does a mean John McCain impression), the Barely Political folk, the tooth-hurtingly funny Fred Armisen, and FBNY’s current roommate and bringer of good things, HuffPo’s Rachel Sklar, whose rendition of American Pie is featured below.