YouTube has released a list of its most-watched videos of the year, and also included its biggest search terms broken out by month. You probably won't be terribly surprised to hear that Rebecca Black's "Friday" (disclaimer: I can proudly say that I still have never seen this video) tops the main list, while Jennifer Lopez's "On the Floor" was the most-watched music video. Music videos in fact are the largest chunk of YouTube's viewership, but there is also a great smattering of talking babies, cute dogs, and hugging kittens thrown in there for good measure.