On Wednesday, comScore, Inc. (NASDAQ:SCOR), released its August analysis of U.S. web activity for the top online properties. This comes from its comScore Media Metrix service data.

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Before we get to the top properties list, comScore, Inc. (NASDAQ:SCOR) cited three methodology enhancements for its August 2012 release, which affected data.

Take a look.

The first enhancement is the inclusion of updated demographic estimates using data from the 2010 U.S. census. The second one is an improved comScore’s enumeration survey methodology; this will be an improved representation of people who reside in cell-phone only homes. The third enhancement has new techniques accounting for the rejection of cookies in Safari browsers for the sites measured from comScore’s Unified Digital Measurement (UDM) methodology.

From the August changes, comScore’s, Inc. (NASDAQ:SCOR) monthly press releases will now include only current monthly rankings and it will get rid of month-over-month percentage changes. Look for the September release to go back to its usual reporting of the aforementioned.

Now, without further adieu, here’s a sampling of the Top 50 properties.

Really, no surprise here, Google Sites (NASDAQ:GOOG) came in as the #1 property, with 187 million visitors, followed by Microsoft Sites (NASDAQ:MSFT), with 170 million at #2, and at #3, Yahoo! Sites (NASDAQ:YHOO) with 164 million.

Facebook Inc. (NASDAQ:FB) followed behind at #4.

Rounding out the top 10 was AOL, Inc. (NYSE:AOL) at #5, #6 Amazon.com, Inc. (NASDAQ:AMZN), #7 Ask Network, #8 Glam Media, #9 Wikimedia Foundation sites, and #10 CBS Interactive.

Joining the social media giant were the additional properties of Linkedin (NASDAQ:LNKD) at #26, Twitter.com #28, Tumblr.com #39, Myspace #43, and Instagram.com #48 in the Top 50.

comScore also included in its August release, Display Ad Ecosystem Rankings. This provides additional clarity for ad publishers, networks, and other platforms classification that makes up the ecosystem.

For the syndicated Ad Focus entities, ShareThis came in as #1 in August, with an 87 percent reach of Americans online. Rounding out the list was Google at 81.6 percent, Yahoo! Sites at 74.3 percent, Outbrain at 72 percent, and Facebook.com with 69.2 percent.

For Advertising Networks and Buy Side Networks, PulsePoint took the #1 spot with its 96.4 percent reach. The list then included Vibrant Media with 93.1 percent, Specific Media with 93 percent, Google Ad Network with 92.7 percent, and AOL Advertising 84.2 percent.

For its DSPs, SSPs, and Ad Exchanges (this will include many additional entities in the upcoming months), Rubicon Project REVV Platform reached 96.6 percent of Americans online.