YouTube Not #1 in Video Ads Served

comScore’s May ratings show YouTube still the top source for online video viewing, but it’s not the leader in serving up video ads. The winner in that category is Hulu, which delivered 1.3 billion for the month. Interestingly, despite holding down the top spot in ads served, Hulu ranks #10 in terms of unique users. However, it’s #2 to YouTube in the amount of time that viewers spend on the site. YouTube clocks in at an average of 5 hours, 11 minutes, while Hulu comes in at 3 hours, 37 minutes. No other site even reaches 22 hours.