Twitter's international user growth is far outpacing its domestic rate.
Since 2010, Twitter's international user base has grown 745% — from 20 million to 169 million users. Its user base in the United States has only grown 390%, from 10 million to 49 million users.
See also: This Is Why No One Follows You on Twitter
Statista's chart, below, shows Twitter's relative growth in the U.S. compared to its growth internationally.

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