Mark Zuckerberg made $3.5 billion last month (November) Facebook's stock shot up from $21.08 a share on the first day of trading in November to $28 a share at the end of the day Friday, its highest price since July. Zuckerberg, who owns about 504 million shares of Facebook stock, gained about $3.48 billion as a result... When Facebook first went public at $38 a share in May, Zuckerberg’s shares were worth $19.1 billion. In the following months, the stock dropped to less than half that IPO price to $17.55 in late August, pushing Zuckerberg’s net worth down to $8.84 billion. Since then, Facebook’s stock has recovered in fits and starts and so has Zuckerberg’s wealth. November proved to be by far the most robust growth month for the stock to date, thanks to two big factors. First, the company had a strong earnings report in late October, which showed that Facebook was making progress in monetizing mobile. Seco...