Twitter reportedly closes $15 million funding round

Although it still lacks a business model (except in Japan), the geek staple gains further traction--and now, according to reports, an $80 million valuation.

Microblogging service Twitter has reportedly closed a $15 million Series B funding round, according to Om Malik of GigaOM.

Malik estimates that it will bring the company's valuation to about $80 million and that the round is led by a new investor rather than existing investor Union Square Ventures (though the latter is participating). CNET originally reported late in April that Twitter had signed a term sheet for either $15 or $20 million.

Rumorspeg the new lead investor as Boston-based Spark Capital. An independent source hinted to CNET that this is likely indeed the case.

But even as Twitter's valuation reportedly escalates, and it slowly breaks into the mainstream from Silicon Valley (Oscar-winning screenwriter Diablo Cody recently discovered it), problems remain: Only its Japanese edition displays advertisements, and executives still haven't unveiled any alternate revenue stream. And despite a recent employee shuffle on the engineering side, the service is still plagued by outages that, while certainly not any kind of global catastrophe, can be quite a bit annoying for active users.

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