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A study by Harvard Business School researchers concluded that 10% of Twitter members account for 90% of tweets.

As micro-blogging is so popular, are we seeing the effect of Long Tail theory for Twitter, which finds a niche strategy that helps it sell a large number of social networkers, each in relatively small quantities of 140 characters max?

Interestingly, another research by web analytics firm HubSpot discovered that nearly 55% of 4.5 million Twitter members monitored have never "tweeted" -- meaning they signed up for Twitter service but never fired off any "Twitter" message to share, people like Ah Hai.

Interesting still, HubSpot said more than half of Twitter members have no followers, and about 55% of them aren't following anyone else's micro-messages,

See "State of the Twittersphere" report by HubSpot in PDF.