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Earlier this month, a Pew Research Center survey found that 22 percent of U.S. adults use Twitter. from Pew was published today and it found that a large majority of tweets come from a small minority of tweeters. In the U.S., the top 10 percent of tweeters account for 80 percent of all tweets while the bottom 90 percent of tweeters account for a mere 20 percent of all tweets.