1. Zynga Inc (NASDAQ:ZNGA) developed some of the popular social media games like Farmville and Mafia Wars. It witnessed a huge slide of its shares in 2012 and is now trading at $3.39, lower than its 52-week high of $9 a share. Much of the slide happened because the initial enthusiasm levels gradually waned after the Facebook Inc (NASDAQ:FB) IPO. The fact that the stock is undervalued can also be seen from the $200 million buyback the company announced in February.