Facebook Files For $5 Billiion IPO; Co-Founder Zuckerberg Holds 28.4% Of The Stock, Accel, 11.4%: UPDATEDByMark Boslet1 February 2012•2 mins readJavaScript is required to read this article. Please enable it in your browser and reload the page.ManagersNorth AmericaUSBriefs