If you want an up-to-the-second look at how much Mark Zuckerberg is worth now that Facebook is public, the "Wall Street Journal" is here to meet your voyeuristic needs.

They put together an online tool called the Mark Zuckerberg Wealth-o-Meter that constantly updates to show you how much his Facebook shares are worth.  Over the weekend, it was at $19.2 BILLION.

Here's how they do the math: His total shares (503.6 million) held after the IPO, multiplied by Facebook's share price ($33.93)

As of 10:30 this morning, he was sitting at $17.09 billion.

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