Facebook's finance chief, Gideon Yu, is leaving the fast-growing social-networking site as the company looks for a replacement with "public company experience." It's the latest sign that the site may be looking to go public in the not-so-distant future, though the company has said it has no immediate plans for an initial public offering. Palo Alto, California-based Facebook said Tuesday that Yu, 37, has played an important role in establishing the company's core financial operations. He became Facebook's CFO in July 2007 after stints with Yahoo Inc., Google Inc.'s YouTube and a venture-capital firm. At YouTube, Yu helped negotiate the site's sale to Google in a deal valued at $1.76 billion when it closed in 2006. Facebook, which is nearing 200 million users worldwide, said that despite the recession it is pleased with its financial performance and that it's in a good position for its next stage of growth.