It's that time of the year — best of 2009 time! And to kick off our fun, comprehensive coverage of the most popular GeekSugar content from the past year, I thought I'd turn the attention to one of the most talked about topics of 2009 — social networks. I've pitted five of the top ranking social networking sites of '09 against each other, and I can't wait to see which one is your favorite. Some of you have already said that you prefer Facebook over Twitter, but what about the others? Which one will take home the coveted Best of 2009 Sugar Award? Time to weigh in below!