In a report on Twitter growth worldwide, marketing research company, comScore, documented 93 million visitors (aged 15 and older) to Twitter in June 2010.

The estimation for June showed a 109% increase of Twitter visitors from last year’s figures. Globally, Indonesia received the highest penetration, with 20.8% of internet users in the country visiting Twitter in June. Brazil and Venezuela followed with the next highest figures of 20.5% and 19% respectively.

In an analysis of the five major global regions, the strongest user growth in June was felt in Latin America, with a growth of 305% to 15.4 million visitors. Asia Pacific followed with a 243% growth to 25.1 million visitors. The Middle-East grew by 142% (5 millions visitors), Europe increased by 106% (22.5 million users) and North America saw a growth of just 22% (25 million visitors).

According to Graeme Mudd, comScore vice president of search and media, “Today nearly three out of four global internet users access social networking sites each month, making it one of the most ubiquitous activities across the web.”

The study also interrogated Twitter usage via mobile. In the U.S. 8.3% of smartphone users (4.2 million) accessed Twitter via mobile, while in Europe 2.8% of smartphone users (1.7 million) were said to be accessing Twitter via mobile. The U.K. experienced the strongest penetration in the region at 5.8%, followed by Germany with 3.1% and France with 2.1%.

The advanced web browsing features of smartphones enable this behavior, making it likely to accelerate as these devices gain continued adoption. While desktop-based internet usage is still king, mobile web usage is surging on a global scale placing applications like Twitter at the forefront of that paradigm shift,” said Mudd.