• Business Insider, Friday, April 1, 2011 12:07 PM

According to Twitter's "about" page, the service has 175 million registered users. However, "What ["registered users"] really means is the number of accounts," notes Business Insider. "So, according to Twitter, 175 million Twitter accounts have been opened during Twitter's history." How many people actually use Twitter? Well, there are currently 119 million Twitter accounts following one or more other accounts, according to a source with full access to Twitter's API.

Meanwhile, there were 85 million accounts with one or more followers. "With these figures, and Twitter's claim of 175 million accounts, a little subtraction shows us that there are 56 million Twitter accounts following zero other accounts, and 90 million Twitter accounts with zero followers," Business Insider concludes. By contrast, Facebook says 600 million people visit the site each month, and that half come back every day.

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