Twitter exceeded 500 million users registered and keeps growing with 10 new users per second, according to the tracking website TwopCharts.com.
Even though Twitter has not yet confirmed the number, Twopcharts.com has been using Twitter's data to calculate the number of registered users the social network has. The third party site looks at ID numbers associated with each account, which are unique and appear to be sequential, starting with number 1 in 2006 when the micro blogging site started.
It is expected that Twitter will reach 600 million registered users in mid-June 2012.
While Twitter has a little bit over half a billion users, Facebook is expected to reach the 1 billion mark in the next couple of months. Google+ has more than 100 million users.
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