Does Twitter Have Half a Billion Users?

Has Twitter really hit 500 million users, as a new study claims -- or is the company drowning in fake accounts?

Twitter tends to be very careful when it comes to announcing user numbers. Wary of its problem with bots and spam accounts -- such as the thousands that have started following Mitt Romney in the past few weeks -- the company appears to have a policy of only discussing the number of active users.

Back in September 2011, in a State of the Union-style talk at Twitter headquarters, CEO Dick Costolo said there were 100 million active users who log in at least once a month, while 50 million log in every day. On the company's sixth birthday back in March, it announced the numbe…
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