Twitter now has 100 mn active users

SAN FRANCISCO, USA: More than 100 million users are "active" and log onto Twitter daily, or about half its registered members, and a growing number are doing so from a plethora of mobile devices, Chief Executive Dick Costolo told reporters on Thursday.

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Costolo said the microblogging site was chalking up about 40 percent growth every quarter in mobile usage.

Twitter.com now sees about about 400 million unique visitors every month, a 60 percent leap from 200 million at the start of the year.

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Twitter, which allows people to send 140-character text messages, or Tweets, to groups of so-called followers, is one of the Web's most popular social networking services, along with Facebook and Zynga and Google Inc's embryonic Google+.

Analysts have sought details however on how many of Twitter's users are "active", a key metric in determining its business potential.