Shares of social reviewer Yelp (NYSE:YELP) have been on a run so far this year, tapping all-time highs near $60 per share. That rally has translated into frothy valuation figures, as investors are now banking on major growth in the years ahead. The mobile business continues to grow, but Yelp's advertising business is far from immune.

In fairness, Yelp has defended itself well against the likes of Google (NASDAQ:GOOGL), which tried to acquire Yelp years ago for much less. Even though Yelp has some legitimate opportunities, the valuation just seems too high relative to the growth that Yelp will need to put up.

In the following video, Fool contributor Evan Niu, CFA, and Eric Bleeker, CFA, express skepticism over Yelp at the current prices.