YouTube by far dominates, delivering 10 times as many streams as its nearest rivals. Competitor services such as Hulu, however, are seeing significant growth. YouTube streamed 6.4bn clips, reaching 106m unique viewers. Hulu, which signed musiccontent deals with EMI and Warner Music late last year, streamed 635m videos to 13.6m unique viewers.

In total 137.4m people in the US watched online video last month, an increase of 10.3% from December 2008. Over 10.7bn videos were streamed in the period, up ...