Short Sellers Climb Aboard The Twitter Train (GRPN, TWTR, ZNGA)

Among the social media companies based in the United States, Groupon (NASDAQ: GRPN ), Twtter (NYSE: TWTR ) and Zynga (NASDAQ: ZNGA ) saw significant upswings in short interest between the November 15 and November 29 settlement dates. The number of shares sold short in Angie's List, eBay,