Douglas Quenqua, ClickZ

Twitter continues to sign up users at a remarkable rate, though a vast majority of those users almost never use the service, according to a new study from RJMetrics. The online measurement firm, which is based in Camden, NJ, analyzed Twitter’s backend data for a closer look at the numbers behind the nearly three-year old social platform.

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http://www.loyalty360.org/index.php/industry_news/article-new/twitter_hits_75_million_users_most_of_them_inactive/