In a quiet fund-raising effort, Ning has raised $15 million more, a round that is valuing the social networking start-up at an eye-popping $750 million.

The money for this fifth Series E round comes from Silicon Valley’s Lightspeed Venture Partners.

The Palo Alto, Calif.-based Ning, founded by well-known entrepreneur and Ning Chairman Marc Andreessen and CEO Gina Bianchini, confirmed the funding when contacted by BoomTown. It was not actively searching for funding.

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It’s finally official: Marc Andreessen has crossed over to what he once called “the dark side” and is now a venture capitalist.

Several weeks ago, BoomTown broke the news that the Silicon Valley legend and serial entrepreneur and his longtime investing partner, Ben Horowitz, had completed the raising of $300 million for a new venture fund.

And, indeed, the new firm–which is made up of just the two–is now launched and called Andreessen Horowitz.

Of course, I had done a video interview with Andreessen with my Flip.

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Even in the midst of a tough investing environment, Silicon Valley legend and serial entrepreneur Marc Andreessen and his longtime investing partner, Ben Horowitz, have completed the raising of his new venture fund, according to the numerous sources close to the situation, and it is oversubscribed.

Sources said the fund–which was nicknamed “Project A,” but is actually called Andreessen Horowitz–will be $300 million. It is $50 million over the $250 million he and Horowitz had planned.

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Last night, well-known Internet entrepreneur Marc Andreessen appeared on the “Charlie Rose” interview show, talking about the digital sector and unveiling the news that he is creating a new venture fund.

I had heard rumblings about Andreessen’s funding efforts earlier this week, with sources I talked to jokingly nicknaming it “Project A.”

Actually, Andreessen said the new firm is called Andreessen Horowitz (zzzz), because he is doing it with longtime investing partner Ben Horowitz.

“For the first time in my life, I am crossing over into the dark side,” said Andreessen.

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