YouTube received more than 100 million unique visits in January 2009, making it again the most widely-viewed video service in the USA. The chart below of data from comscore shows the top 10 video sites among US Internet users, based on unique viewers.

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Of course, YouTube owes much of its growth to the users who generate the majority of content on the site. eMarketer estimates that 9% of US Internet users (18 million people) will create user-generated videos in 2009.

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