Annual changes of note: Facebook at #5 with a rocket, Twitter entered Top 50 in June '09, Demand Media, Answers.com and Break Media sites to watch.

comScore has just released their latest
Media Metrix rankings for the Top 50 U.S. Web Properties. If we compare the top 50 to one year ago, we see that the top 4 is still the same: Google, Yahoo, Microsoft, AOL. But there's one notable entrant to the top 5: Facebook. Last year the same list by comScore had Facebook ranked number 16. As of July 2009, it is number 5 - which comScore confirms is its highest ranking yet. What's more, guess who Facebook displaced at number 5? That's right, Fox Interactive, owners of increasingly untrendy MySpace.

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Top 50 U.S. sites, July 2009; source: comScore

Top 50 U.S. sites, July 2008; source: comScore

Facebook is the only new entrant to the top 10 since one year ago, moving CBS out of that esteemed company.

It's a little surprising to see that Yahoo is still very competitive with Google, showing that Yahoo's portal approach is still paying off, even in this late stage of 'w