Facebook (FB -3.8%) and Yelp (YELP -2.9%) sell off following Groupon's Q2 debacle. Yelp could...

|About: Facebook (FB)|By:, SA News Editor

Facebook (FB -3.8%) and Yelp (YELP -2.9%) sell off following Groupon's Q2 debacle. Yelp could also be affected by ongoing concerns about Google/Frommer's. Facebook's first lock-up expiration arrives in two days.