As Facebook took to the stock market last Friday, their share price initially rose as high as $42.05, but ended up the day essentially flat at $38.23 (and only because underwriters intervened to somewhat artificially prop up the price).
A second day of trading saw their share price begin to move steadily in the downwards direction, losing $4 (~10%). At the time of writing, the NASDAQ-listed stock has lost another 5% in value. So after just 2.5 days, the stock is down about 15% with respect to its IPO price. As investors get ready to dump more stock, I am happy to help by presenting the new facebook button that you can add to your website:
Made in Keynote, using thumbs down image