In April, 78 million US internet users watched video online according to comScore. This represents 83.5 percent of the total US internet audience. In that same period, 21.7 million Canadian internet users watched internet video.
Youtube attracted 135.7 million US internet viewers who watched 13.0 billion web videos in the month of April--96 videos on average per US user. Vevo attracted 43 million US viewers--this number includes those users who watched video on Vevo's Youtube channel.
Worldwide, Youtube has 450 million people who watch 60 billion web based videos.