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There aren’t many big changes in comScore‘s July list of the United States’ 50 most popular online properties. Google‘s websites continue to occupy the top spot, with more than 141 million unique visitors in July, followed by Yahoo with 140 million, then Microsoft and AOL. But some companies are moving up fast, including CBS and Facebook.

We received an early copy of the list, and you can see the top 20 at the end of the article — ad-driven properties are in darker text, and the number of visitors is given in the thousands. (As we’ve noted before, you shouldn’t assume these third-party numbers are completely reliable, but rather use them as one of many data sources.) Here are some of the more interesting trends:

  • CBS leaped from 37th to 10th on the list, with its visitors more than doubling, from 20.9 to 48.2 million. It’s no secret what happened here: It acquired CNET, which had almost 32.8 million visitors of its own on the June chart.
  • Facebook continues to see healthy growth, going from 35.7 million uniques in April to 39.1 million in July. ComScore also released numbers showing that Facebook and and other social networks are still growing globally.
  • Traffic for Fox Interactive, which owns MySpace, has been bouncing around for the last few months, but its April and July numbers are pretty similar — 87.5 million and 88.3 million, respectively.
  • The New York Times’ properties, including, received around 4 million fewer unique visitors than they did two months earlier.
  • Between April and July, vertical ad and media network Glam Media grew by nearly 9 million unique visitors.

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