Semiocast conducted the study by analyzing data such as time zone, geolocation and language of 517 million Twitter user profiles created before July 1st 2012, as well as a sample of 1.058 billion public tweets posted from June 1st to June 30th 2012.
With 141.8M accounts created, the United States now represents 27.4% of all Twitter users, the study points out. Brazil ranks second with 41 million users, and Japan takes the third position with 35 million users.
In addition to having the highest number of users, Americans are also the most active Twitter users. According to Semiocast, 25.8 percent of all public tweets hail from the US. Japanese users are the second most active Twitter users, with Japan accounting for 10.6 percent of all tweets.
Twitter is experiencing phenomenal growth in Brazil. The rate of registration of new accounts grew from 33.3M in January to 41.2M in July 2012. Japan, which lost to Brazil its second rank in terms of number of user profiles, recorded the second slowest growth in the top 50 countries.
This study further reveals that Jakarta is the most-active city on Twitter, with 2.4 percent of all tweets originating in the Indonesian capital. Tokyo ranks second, London ranks third, and New York,the first U.S. city in the list takes the 5th position.
Find the complete report of the Semiocast study here.