Facebook shares hit again on valuation doubts

The selloff in Facebook's shares deepened on Tuesday, as investors continued to question the stock's valuation after Reuters reported that underwriters cut their revenue forecasts for the company before the IPO.Facebook's shares hit a low of $30.98 on Tuesday, 8.9 per cent below Monday's close, a loss of 18 percent from their $38 IPO price.At the low, the stock had lost 30 per cent from an intraday high of $45 hit shortly after tradi...