Google+ attracted 2.6 million visitors in the UK in November last year, according to the first UK traffic estimates since the social network launched publicly in September.
Figures released by online metrics firm ComScore show that worldwide visitors to Google's social network rose to 67 million in November, up from 20 million in the three weeks after its invitation-only launch in July last year.
US visitors to Google+ reached 14.7 million in the period, according to comScore, boosted by a rare TV ad campaign from the internet giant.
Separate traffic estimates released by metrics firm Experian Hitwise earlier this week reported that Google+ had almost 50 million US visits in December, up from 30 million in the previous month.
Google stepped up attempts to coax users towards its fledgling social network in the runup to Christmas, as rival players Facebook and Twitter increased their pressure on the internet giant with a series of new feature launches and, in Twitter's case, redesigns
Google went as far as to redesign its homepage in September to try to draw users' attention to the new player in the market.
Traffic estimates from comScore show that UK visitors to Google+ rose almost threefold between September and November, to 2.6 million visitors, as the site moved out of its invitation-only stage.
Google+ visitors by country, in millions. Source: ComScore
While the US continues to dominate visitors to Google+, the figures show that the social network already has a significant reach in Europe.
Google+ visitors in November 2011 as a percentage of country's internet population. Sources: ComScore, InternetWorldStats
"Europe currently has the largest Google+ audience, and 6.1% of European internet users visited the site during [November]," said Mike Read, managing director of comScore Europe. "The UK ranks as one of its largest audiences with nearly 2.6 million visitors and a penetration of 6.9% – the 10th-highest reach globally.
But in proportion to internet population, the country in which Google+ achieved its highest penetration according to ComScore's figures was Canada, where 9% of available internet users visited the network. The next biggest was France, with 7.5%, followed by Spain (5.5%) and Germany (5.2%). The UK was just ahead of the average of 4.9%.
"The site has grown significantly since its launch and it will be interesting to see if increased exposure throughout the Google network, including Google Search and YouTube, will further accelerate its growth around the globe," Read said.
India was second behind the US in with 4.3 million visitors in November, according to comScore, ahead of Brazil with 3.6 million, and Germany and France racking up 3.4 million visitors each.
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