The findings of the research firm Nielsen Online suggest many people don't see the point in spending time on Twitter. The service has attracted millions of new users who can share information in messages, or "tweets," limited to 140 characters.
Twitter didn't immediately respond to a request for comment Wednesday.
Nielsen says the San Francisco-based service attracted a U.S. audience of 13.9 million in March, an increase of more than 20-fold from roughly 500,000 users at the same 2008 juncture.
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