EMarketer, in its first forecast of Twitter users worldwide, said Asia-Pacific will account for 32.8 per cent of Twitter users, compared with 23.7 per cent in North America in 2014.
The research firm said growth for Twitter is heavily weighted in emerging markets, with India and Indonesia to see the most consistent growth patterns.
"India and Indonesia will rise to have the third and fourth-largest Twitter populations in the world in 2014, with 18.1 million and 15.3 million users, respectively, both surpassing the UK for the first time this year for the number of users," it said.
"By 2018, Asia-Pacific will more than double North America's share, breaking the 40 per cent mark in terms of worldwide market share. If China is on the Twitter map by that point, that share is likely to be significantly higher," it said.
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Overall, Twitter's user base will increase 24.4 per cent to 227.5 million users in 2014 from 182.9 million last year.
The firm projected that by 2018, Twitter will grow 10.7 per cent to reach almost 400 million users globally.