From the article: > For Mr. Zuckerberg, the deal may double his personal fortune, which Forbes estimated at $6.9 billion when Facebook was valued at $23 billio

From the article: > For Mr. Zuckerberg, the deal may double his personal fortune, which Forbes estimated at $6.9 billion when Facebook was valued at $23 billion. That would put him in a league with the founders of Google, Larry Page and Sergey Brin, who are reportedly worth $15 billion apiece.