Facebook CFO Gideon Yu never, ever sleeps. He's helping the social network raise another $500 million, on top of Microsoft's $240 million, from two hedge funds, at the same rich $15 billion valuation. Word is that some venture-capital firms were interested in buying into Facebook so they could get some of the buzz, but were priced out of the financing round. I wonder if Sequoia Capital, shut out of earlier Facebook rounds, was still trying this time. [The Secret Diary of Steve Jobs]