Alcoa Earnings, Tiffany Sales, Jim Cramer Targets Twitter for Gains

This week we will kick off fourth quarter earnings announcements and on Monday Alcoa, gainer of nearly 60% over the last 12 months on markets, will lead it off with earnings -- expectations are much higher. Plus, Tiffany will report same-store sales and the company is looking to notch big gains after tacking on 15 percent on public markets over the last 12 months. And Jim Cramer likes Twitter -- just not its CEO, who presided over a 30 percent share price plummet. But, Cramer says the stock is oversold, and if Costolo goes, the micromessaging network could be up for big gains.