Since its IPO in 2012, Facebook, has lost nearly a third of its value. Wall Street's elite will be looking for signs that social networking is making strides in monetizing mobile ahead of the company's earnings next week. A bullish Stephanie Link faces off with a bearish Josh Brown. And Bill Nygren, Oakmark Value Fund, provides his top stock picks including General Motors. Also CNBC's Josh Lipton has the latest on what's driving down shares of Tesla Motors.