Cramer: Gains in Groupon, Yelp for Real? By: CNBC.com News May 09, 2013 at 18:53 PM EDT In the past 3 months Groupon has gained more than 15% and Yelp has surged more than 40%. What should you make of the moves? Jim Cramer is curious. Read More >> Related Stocks: Groupon Cl A Yelp Inc