Research firm comScore has just released data about the U.S. online video market from December. Americans reportedly watched 33.2 billion videos online during that month. 178 million users watched video online. Google sites ranked at the top of the list by a significant margin, just like usual. Hulu was next in line with about a 12 million video difference. Google sites accounted for nearly 40% of the market share, with Hulu accounting for 3%.