By | October 05 2012 12:38 PM

Shares of Zynga Inc. (Nasdaq: ZNGA) sank to a new low Friday following the social game developer’s announcement of a gloomy third-quarter outlook. Prices dropped as low as $2.21 in Fridaytrades, more than 20 percent. The San Francisco company had already lost more than half of its market value since its initial public offering last December.