Nearly one-quarter of Twitter users (22.5%) account for 90% of all tweets posted on the popular microblogging site, while a small hard-core group of Twitter users (2.2%) account for over one-half (58.3%) of tweet activity, according to a study by Sysomos.

Most Twitter users (80.6%) have issued fewer than 500 tweets, while only 2.7% have made more than 5,000 tweets.

Below, other findings from the Sysomos report titled Inside Twitter, based on Twitter activity of 20 million Twitter users in 2010.

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