(Image source: wired) Facebook Inc (NASDAQ:FB) shares are trading lower this morning on news that its founder Mark Zuckerberg is selling 41.4 million shares valued at $2.3 billion to satisfy a tax bill from Uncle Sam. The shares that Zuckerberg will be selling involves Facebook’s class A common shares. After the sale, Zuckerberg’s voting power will be reduced to 56.1 percent.