YouTube celebrated its tenth year anniversary last Saturday on Valentine's Day, but it's clear that it is facing a steady new stream of competitors such as Facebook, Twitter and an emerging group of enterprise-class online video service providers. However, it appears that these competitors aren't having much of an effect--at least in the near-term. According to comScore, YouTube racked up over 163 million unique views on desktop computers in December. Sam Bookman, editor of FierceOnlineVideo, analyzes the possibilities in her latest column.