At around 1300 hrs EST the 500 Millionth user on the micro blogging site Twitter signed up, and so far @JanickiPiotr has not tweeted, followed or put any information whatsoever on the landmark page.
Twitter becomes the second social media site to hit the 500 million users. The other site being Facebook, should be hitting the one billion user mark at some point during this year!
Currently it is estimated that Twitter is adding around fourteen new accounts per second and at that rate it will reach 600 million users in just over a hundred days time.
Source [Daily Dot]