Twitter has it surpassed the billion users?

Twitter is definitely in vogue in recent months. First it is the young who have approached this social network Facebook by releasing a few. And Twitter is a bit like MSN, and we also saw the odd texting or resurface.
And then, as we have seen in the French statistics, population a little more aged, seniors are told, were also seized this social network.
Twitter has a policy a bit special, they do not report number, whether the number of users, or even the financial figures. Furthermore, you hook well, some analysts believe that the value of Twitter is expected to reach $ 11 billion in 2013. The publicity Maintenat well taken on Twitter, tweet Sponsored being more numerous.
Since Twitter does not ComUnique figure, we must work with estimates. And this is the site that launches today Twopchart figures who wobble.
Twitter count today more than 1 billion users in any case of open accounts, we know that 40% of these accounts, at least, are often inactive or followers.
Moreover, the site is even estimates of new accounts per day, minutes and even seconds. We talk more estimates than reality, not knowing the truth.
But we also know that a year ago, Twitter had 500 million registered users.