Peter Thiel's behind-the-scenes war with Sequoia Capital continues. The latest battleground? Gideon Yu, YouTube's former CFO, had planned to leave after the Google buyout of the online-video site to hook up with Sequoia as a partner. Instead, he's joining Facebook, the social network in which Thiel is an investor and a board member, as its CFO. It's a loss for Sequoia partner Michael Moritz, who has feuded with Thiel's Founders Fund. But it's undoubtedly a gain for Facebook. The social network, whose board members already like to play fast and loose with revenue figures, needs a CFO who's not above a little white lie. Like, say, YouTube's budget. Or what his career plans really are.