Google's YouTube leads online video market, with Facebook and Yahoo trailing

Google's video sites, including YouTube, attracted the most viewers during the second quarter, according to comScore. Facebook and Yahoo Sites held firmly to the second and third positions, the firm said, with Google taking the lion's share of unique views.

ComScore said VEVO and Maker Studios battled for fourth and fifth place.

Interestingly, though, the research firm said the real battle in market share occurred among the smaller online video providers, with Vimeo, Fullscreen and Comcast/NBCUniversal appearing throughout the quarter but frequently being displaced by less-established properties such as AnyClip Media, Machinima and new entrant CBS Interactive.

For more on these numbers and more, check out this FierceOnlineVideo special report.