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YouTube has come to define the era of online video, so let's take a look at its most popular videos of all time. Our latest update has Justin Bieber still at number 1 with Baby, which was the first video to earn a half a billion views! Currently, Bieber and Eminem between them make almost half of the top 10. Also of note is a music video by Jennifer Lopez called On The Floor ft. Pitbull, which has risen to number 2 with almost 500 million views in only 10 months.

We first did this list in August 2007, at which point Evolution of Dance by comedian Judson Laipply was number 1 with nearly 56 million views (it's now outside the top 10). The next update was September 2008, when Avril Lavigne's Girlfriend pop music video was number 1 with 103 million views. In January 2010, Charlie bit my finger - again ! was number 1, with 148 million views. By the beginning of January 2011, Justin Bieber was at number 1 with over 400 million views for Baby.

Here is the top 10, as of February 2012:

YouTube announced Creative Commons licensing options for videos hosted on the site today, making it much easier to use and share videos with legal attribution.

Creative Commons on YouTube will allow users to splice clips or scenes from other videos through the YouTube Video Editor. Copyright and Creative Commons can be a tricky area as there are several different Creative Commons options. YouTube tries to make it easy by using only one -- CC BY 3.0 -- that permits users to share and adapt content for commercial use provided that attribution is given to the original creator.