Social media stocks tumble on tepid Facebook IPO; Zynga, Yelp hit all-time lows

Qype is Europe's answer to Yelp, and it's grown to more than 25 million users around the continent. But is a new publicity campaign touting its expansion a prelude to further investment -- or is it shopping around for a sale?Facebook's IPO is dragging down the share prices of Zynga, Yelp, Renren, LinkedIn and Pandora Media.Yelp employees who plan on bringing their canine to work better be careful, especially its CEO Jeremy Stoppelman, who's been

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