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Mark Zuckerberg’s net worth plunges $5 billion on Facebook data controversy

[FILE] A photograph of Facebook CEO Mark Zuckerberg unveiled a new version of its website on Thursday, september 22, 2011 that is based around the idea of a personal "timeline" rather than its standard profile pages.

Facebook shares took a big hit Monday, shaving about $5 billion off of Mark Zuckerberg’s net worth.

The stock tumbled nearly 7% Monday on news that data firm Cambridge Analytica, which had ties to Trump’s campaign, reportedly accessed information from about 50 million Facebook users. This is the stock’s biggest drop, on a percentage basis, in about four years.

Zuckerberg holds about 400 million shares of Facebook through various entities that he controls, according to a filing last week. Shares were down $12.61 in midday trading.

Of course even with the single-day drop the value of his holdings, Zuckerberg still owns about $69.6 billion worth of Facebook shares. That’s enough to make him the sixth richest man in the world, according to Forbes’ real-time billionaire tracker.

To put the dollar drop in context though, when Zuckerberg took Facebook public in 2012, the value of his Facebook shares was about $19 billion. Facebook posted a drop of greater than 7% in a single day on seven different occasions in its early days of trading. But this is the biggest single-day slide ever in terms of dollar value for the stock.

The stock fell Monday after the Cambridge Analytica controversy prompted some outside observers to suggest that Facebooks should be more regulated. Some users have vowed to stop using Facebook and there are also questions about what the company will have to do to restore public trust in Facebook’s commitment to privacy and data protection.

— CNN’s Paul La Monica, Patrick Gillespie and Dylan Byers contributed to this report