Facebook shares fall 8%

Shares in Facebook fell again at the open today as doubts about the company's valuation increased after media reports underwriters cutting their revenue forecasts for the social networking site shortly before the IPO.

Facebook's shares hit a low of US$31.73, 7.4 percent below Monday's close, and are now trading down 17.1 percent down from their US$38 IPO price. The shares are down 30 percent from a high of $45 hit shortly after they started trading on Friday.