2012 began with great expectations for the tech sector. The long-awaited Facebook IPO was set for May and two other hot startups - Zynga and Groupon - had just gone public. The tech eco-system seemed to be ticking along nicely, with fresh ideas going in one side and tremendous value coming out the other. Well, as the year comes to a close, the picture looks much different. Enthusiasm has waned, along with those stock prices.