Well, Twitter didn’t win a Nobel Peace Prize for its role in getting the word out about the Iran election protests earlier this summer, but it did gain about 7 million new visitors in the month of June. Twitter’s website attracted a total of 44.5 million unique visitors worldwide in June, 2009, according to comScore.

Twitter’s worldwide audience grew a healthy 19 percent from May, 2009 (and an even healthier 1,460 percent from June, 2008, when its worldwide audience was just 2.9 million).

With 20 million of its visitors coming from the U.S., Twitter’s audience is now 55 percent international. ComScore now counts it as the No. 52 largest site in the world (bigger than ESPN, just shy of the BBC and Craigslist).

These estimates only count traffic to Twitter.com. Since more than half of Twitter users don’t even go to the Website, and instead use Twitter apps to consume and publish Tweets, Twitter’s total audience is even larger. But comScore provides a consistent measure of its growth.

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