Short Sellers Load Up On Pandora and Zynga (GRPN, P, ZNGA) By: Benzinga via Benzinga May 11, 2014 at 16:34 PM EDT Among the social media companies based in the United States, Groupon (NASDAQ: GRPN), Pandora Media (NYSE: P) and Zynga (NASDAQ: ZNGA) ... Read More >> Related Stocks: Groupon Cl A Pandora Media Inc Sina Corp YY Inc ADR Yelp Inc Zynga Inc Cl A eBay