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Investors looking for information on Twitter ahead of its anticipated public offering have very little to go on: the company revealed nothing of its plans, other than a single 135 character tweet.

The one thing we do have some information on – drawn almost entirely from third party monitoring firms – is its user base. Launched in 2006, Global Web Index estimated in January this year the micro blogging site had 288 million active users and is the fastest growing social networking service. Read more