News Briefs Facebook Files For $5 Billiion IPO; Co-Founder Zuckerberg Holds 28.4% Of The Stock, Accel, 11.4%: UPDATED Mark Boslet - 1 February 2012 Share A- A+ 100% Create an account to continue reading Gain instant access to our expert editorial analysis and in-depth insight. Register for free Already have an account? Sign in