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How many people are on Twitter?

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One reliable source for the number of Twitter users is Twitdir. TwitDir is a Twitter users (some call them twitter'ers) directory.
Twitdir reports the number of Twitter users is well over one million.. As Twitdir is only capable of detecting Twitter users with a public profile, this number is a underestimated as to the total number of Twitter users.
According to a story in TechCrunch entitled, "End Of Speculation: The Real Twitter Usage Numbers." the key measure of Twitter usage is total users, total active users and total messages sent. And according to a source close to the company, these are the current Twitter usage stats:
March 2008
Total Users: 1+ million
Total Active Users: 200,000 per week
Total Twitter Messages: 3 million/day

SocialMarketingExpert.org states that since Hitwise says web visits to Twitter have increased 8x in the last year, they estimates the number to be 14,590,000 Twitter accounts in total (most of which may well be "inactive")-- but around 3 million active accounts.
Answer 2
According to figures from eMarketer, Twitter receives over 14million visitors a month from the USA and they estimate that Twitter currently has over 6 million users.
Millions. If you visit their website there is a graph of how many people are using it.
Twitter crossed 200 million members in March,2011.
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How many people use twitter in the uk?

An exact figure is unknown. These statistics are difficult to determine.

How many people are against twitter?

An exact number is unknown. Many parents, teachers , principals , or most any adults that have kids & who aren't hip (cool) are against Twitter as it is a social networking we

How many people have a Twitter in the world?

Just to give you some piece of twitter stats, on March 12, 2011there are 572,000 number of new Twitter accounts created. Attached is related link to Twitter Statistics and Fac