Despite the fact Twitter has been blocked in China since 2009, the GlobalWebIndex estimates 35.5 million of Twitter’s 140+ million active Twitter users are in China.
The U.S. was third with 22.9 million, 2nd was surprisingly India with 33 million active users.
Twitter has passed 500 million registered users with most of them [141.8 million] located in the USA
An active Twitter user is someone who has posted at least once in the last 30 days.
Interestingly China also topped the stats with the most people tweeting about a live TV show. And the number of people in the USA and Mexico tweeting about a live TV show has decreased sharply over 2012 while it has increased from 4% to 14% in Italy over the same time.