Social gaming company Zynga had an outstanding 2011, leading to a well-hyped IPO in December. But Zynga's biggest risk was always an over-reliance on Facebook, with most of its revenue and users coming from the social network. It's now six months after Zynga's IPO and its stock price has halved, currently sitting at under $5. That's because many of its high profile gaming products are tanking.

Read the whole story at ReadWriteWeb