MarketingCharts reports the 10 leading social networking and blog sites for October 2007, based on the list by Nielsen Online. MySpace.com and Google’s Blogger.com remain the undisputed leaders among numerous social networking and blog sites today.

Despite the impressive and consistent performance of Facebook resulting to more than 19 million visitors or 125% growth, it is still a distant second place in the social networking category.

Although MySpace registered only 19% growth, its massive member base of more than 58 million is strong enough to hold its number 1 position.

However, sites Classmates Online, AOL Hometown, AOL People Connection, and Reunion.com all suffered a decrease in number of visitors.

The trend is quite similar among blog sites. As expected, Blogger.com retains its number 1 position and it’s still ahead by 20 million visitors compared with second best, WordPress.com.

The battle for 2nd place is a close struggle between Six Apart Type Pad and WordPress.com. In the September report, Movable Type was in second place. This month, WordPress has already overtaken Six Apart.

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5. comScore releases May U.S. search engine rankings