Stocks to watch on Tuesday:Glu Mobile (GLUU) - the mobile game developer has two games in the top 20 on iOS, yet the stock trades at about 1.5x booking estimates. The market far over reacts to the success of new games. The stock appears poised for a rally higher. Charles Schwab (SCHW) - the brokerage firm cut commissions to zero. Avoid the whole sector as the race to the bottom continues. The winner remains the investors, not shareholders. Yelp (YELP) - not surprising, Yelp gave up all of the gains from the Groupon (GRPN) merger rumors. Now is the time to purchase the stock on weakness as the stock looks to break the downtrend with strong resistance above $35. The stock only trades at 2x EV/S making for a bargain stock down here. Disclosure: Long GLUU, YELP