Online video viewed totalled 13.5 billion in October, up 45 percent over the same period one year previously, according to the comScore Video Metrix service.

Google still topped other online properties, with 100.5 million unique video viewers (up from 83.7 million in April), and each watching 53.5 videos on average, Marketing VOXreported.

YouTube dominated all Google video sites, accounting for 98 percent of all videos viewed there.

Following were Fox Interactive Media/MySpace (60.8 million unique viewers in October), Yahoo (45.2 million), Microsoft (30.7 million), and Viacom Digital (25.7 million).

Hulu, which debuted on the comScore top 10 list, came in sixth with 24.0 million unique viewers, Marketing VOX reported.

Hulu performed very well, considering the duration of the average online video was three minutes, and its average was 11.6 minutes instead. The NBC-Fox joint venture site features full-length broadcast TV programs.

Hulu's overall market share is niche, only 1.7 percent, versus Google's 40 percent and all the other sites' single-digit share, according to comScore. Its ad revenue will possibly equal YouTube's before the second half of 2009, Marketing VOX reported.

The rankings are based on video content sites, excluding video server networks. Online video includes both streaming and download video.