San Francisco - Twitter, the microblogging service that limits posts to 140 characters, has raised "either $15 million or $20 million" in new funding from undisclosed investors, a source familiar with the deal tells CNET News.com.

"There's a lot of interest in the company," the source told News.com.

"It's yet another one of these audience growth stories without any understanding of how they'll turn into a business."

While the U.S. version of the service does not currently feature any advertising, the version launched in Japan last week does in fact carry ads on the Twitter site.

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