Jul 23, 2011 11:31 GMT  ·  By

There's been plenty of interest in determining Google+'s size, especially since it has become apparent that it's probably the fastest growing site and social network in history. comScore is the latest to weigh in, it revealed that Google+ got 20 million visits until July 19, exactly three weeks after launch.

"comScore showed Google+ at just about 20 million visitors worldwide, an extraordinary number in just its first three weeks," the analytics company revealed.

"That number represents an increase of 82% from the previous week and 561% vs. two weeks prior. The U.S. audience recently surpassed 5 million visitors, up 81% from the previous week and 723% from two weeks earlier," it added.

The numbers are consistent with what other companies looking at the metrics have shown. They're also somewhat consistent with the estimates made by others regarding user numbers.

Still, these numbers describe unique visitors which are not the same as users, visitors may simply be reading a Google+ announcement or viewing a public photo even if they don't have a Google+ account.

20 million visitors is not the same as 20 million users, if comScore's numbers are correct, Google+ should have significantly less registered users, at least a few million less.

But research by Paul Allen, who's numbers have proven accurate before, shows that Google+ should have more than 20 million registered users already.

More interesting than the total number of users, is the demographics and location data. US is expectantly the biggest country on Google+, with 5.3 million visitors, but India is not that far behind, there were 2.8 million visitors from the country in the first three weeks.

It's an interesting data point, but one that probably shouldn't be that surprising. Google still has a big presence in the social networking world in India with Orkut, even though it was overtaken by Facebook last year. The company also seems to be determined to conquer the Indian market, creating features catered specifically to the country.