This completely makes my weekend. I'm on my Touch and can't post the article, but basically when the stock didn't soar, people panicked a bit and sold off. Underwriters had to dip into an emergency reserve of shares just to keep the stock above its offering price of $38 and barely did - it ended at $38.23, or up 0.6%.
BWAHAHAHAHAHAHAHA!
ETA: there were also some NASDAQ glitches that contributed to the relatively poor performance but I'm not going to mention those because they take away from my version of events, which is that everyone hates Facebook.