Facebook's big data breach has already cost Mark Zuckerberg $3.8 billion

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Following weekend revelations that Facebook was exploited by data firm Cambridge Analytica in order to harvest 50 million Americans' profiles, founder Mark Zuckerberg saw his fortune drop by $3.8 billion Monday morning, Bloomberg Technology reports.

Facebook stock had plummeted 6 percent by 10:50 a.m. ET, a change of around 12 points, with the S&P 500 tugged down almost 1 percent with the social media giant as its worst performer. That drop means the company has lost around $25 billion in market value, The Independent adds.

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Jeva Lange

Jeva Lange was the executive editor at TheWeek.com. She formerly served as The Week's deputy editor and culture critic. She is also a contributor to Screen Slate, and her writing has appeared in The New York Daily News, The Awl, Vice, and Gothamist, among other publications. Jeva lives in New York City. Follow her on Twitter.