[majc2]

According to http://www.ebizmba.com/articles/video-websites YouTube gets 450,000,000 uniques against NetFlix who get 55,000,000. I'd argue there different markets and the key comparable would be dailymotion at 27,000,000. I think there is a good chance it'd pass the monopoly test.

[tanzam75]

The lead that Youtube has over Dailymotion is enormous. It's higher than the ratio of PCs to Macs at the time of the Microsoft antitrust case.

(Which is why the DOJ defined the market as the one for x86 PC operating systems. That excluded Mac OS from being considered a competitor to Windows, as it ran only on PowerPC at the time.)