Many online players may be diving more deeply into airing videos, but the broader market is still overwhelmingly dominated by Google (NASDAQ:GOOGL), according to the October U.S. online video rankings compiled by comScore (NASDAQ:SCOR). All told, the digital market researcher said that 189 million people watched more than 49 billion content videos during the month.

Google sites, chiefly its dominant, were visited by nearly 165 million of those individuals, who viewed in excess of 16.5 billion videos. A very distant second was Facebook (NASDAQ:FB), with a little more than 70 million and 1.4 billion, respectively. AOL (NYSE:AOL) rounded out the top three, attracting slightly more than 62 million viewers, who watched 1.3 billion pieces of content. 

Trailing behind were Yahoo! (NASDAQ:YHOO) and Microsoft (NASDAQ:MSFT), which landed at a respective No. 7 and No. 8 on comScore's top 10 list. They were outpaced by No. 6 Amazon (NASDAQ:AMZN), with 44 million visitors taking a look at 192 million videos. The giant retailer is currently making a concentrated push into the sphere; today it is premiering a series it's developed, the political comedy Alpha House

Fool contributor Eric Volkman owns shares of Facebook. The Motley Fool recommends and owns shares of, Facebook, and Google. It also recommends Yahoo! and owns shares of Microsoft. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.