TheStreet's Jim Cramer thinks Yelp is undervalued and has been under a huge amount of pressure, including an FTC investigation. Yelp is the modern-day mobile Yellow Pages, and Cramer would not back away from the stock. LinkedIn is problematic for Cramer since he was wrong about the stock moving past $200 after its secondary offering. Finally, Cramer says he is against the GM "sell" call from Morgan Stanley, and at $34 Cramer says GM is a buy. Cramer would also not sell Ford.