Twitter was founded about five years ago. Today, the company announced that they reached their 100 millionth ‘active’ user.Each month the service has 400 million unique visitors. Astonishingly, the micro-blogging service posts about a 350 billion tweets per day--says the company.
Of these active users about half access the social, micro-blogging service on their mobile phones.
There are questions to be asked of Twitter's latest round of stats announcements. One big question is how many of their daily sign-ups are spam accounts? Also, how many accounts are unique owners? Still the latest Twitter numbers are quite impressive.
Source:
https://blog.twitter.com/2011/09/one-hundred-million-voices.html
https://twitter.com/#!/twitter/status/91890490089275392