A report by Nielsen Online on internet video viewing habits in the US shows continuing growth in the category through the end of 2009. As reported in Adweek, Nielsen’s report showed more than 137 million Americans watched online video in December 2009. The number represented a more than ten percent increase compared to the same period last year. The amount of content streamed also increased in the period, jumping nearly twelve percent from 2008. An even bigger jump came in the time per viewer spent watching online video content.  According to the study, individuals spent an average 193 minutes watching videos in the month, a more than thirteen percent increase from December 2008. Nielsen ranked leading online video sites as YouTube, with 106 million unique users getting served more than 6 billion clips in the month, followed by Hulu with about 14 billion viewers watching 635 million clips in the same period. Adweek says Nielsen’s data on Hulu varies greatly from findings by research firm comScore, which recently reported the site having more than 43 million users.