Facebook Chief Executive Worth $5 Billion!?

valleywag.com — Microsoft's $250 million investment in Facebook gives the social networking site a valuation of $15 billion. And sources say Facebook CEO Mark Zuckerburg owns roughly a third of it, sources tell ValleyWag's Megan McCarthy. That could make Zuckerberg the richest 20-something on earth. At least, if he ever manages to cash out. Oct 25, 2007 View in Crawl 4