After Facebook founder Mark Zuckerberg announced that tens of millions of Facebook users may have had personal information breached and shared with Cambridge Analytica, the tech giant is beginning to notify those affected.

Up to 87 million profiles that may have been affected will be notified on their news feed as soon as they log on, and will receive a detailed note on their security and what they should do to keep their information safe online moving forward. Facebook has said that more than 70 million of those 87 million affected are based in the United States.

Even those not directly affected by the data breach will receive a privacy notice starting this week. All 2.2 million users will be provided information on how to turn off third-party access to applications while they are using the social media site.

Facebook CEO Mark Zuckerberg, has said he and the company had made a “huge mistake” allowing the oversight to occur.

Cambridge Analytica used data from various personality quizzes that accessed profile information. The Facebook app that is said to have caused the majority of the breach was one called “This is Your Digital Life,” created by a researcher who paid more than 200,000 users to take it.

In an interview with CNBC, Facebook COO Sheryl Sandberg said the mistake will cost the company years of rebuilding trust with its users.

“This was a huge breach of trust,” Sandberg said, according to CBS News. “People come to Facebook every day and they depend upon us to protect our data and I am so sorry that we let so many people down.”


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