Facebook's Cambridge Analytica breach affected 87 million users

Personal information from up to 87 million Facebook users was improperly shared with data firm Cambridge Analytica, Facebook revealed Wednesday — significantly more than the company's previous estimate of 50 million.

Most of the 87 million users were Americans, the social media company explained in a blog post. Facebook will start notifying users next week if their information was improperly obtained. The post also outlined a number of measures intended to restrict data access for third-party apps, such as disabling a feature that allows users to search for friends using phone numbers, which put "most people on Facebook" at risk of data-scraping.

Facebook has been under intense scrutiny since reports found that Cambridge Analytica, a political consulting firm with ties to President Trump, had harvested user information without permission. Mark Zuckerberg, Facebook's CEO, has agreed to testify before the House Oversight Committee to address the "breach of trust."

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