Facebook admitted Wednesday that personal data from as many as 87 million users was improperly shared with Cambridge Analytica, after originally estimating that 50 million people were affected.

Facebook released the new number new the bottom of a lengthy blog post describing how it would limit access to Facebook users’ information.

Most of the 87 million people effected were in the United States, Facebook Chief Technology Officer Mike Schroepfe wrote.

Facebook has faced scrutiny since it was revealed last month the information of more than 50 million users improperly wound up with Cambridge Analytica, a U.K.-based data research firm that worked with President Trump’s 2016 campaign.

Schroepfe said in his lengthy post that to address the problem, Facebook will restrict third party app access and delete logs of messages older than one year.

Beginning on April 9, Facebook will begin allowing users to click on a link to see what apps they use and what information they share with those apps.

"People will also be able to remove apps that they no longer want. As part of this process we will also tell people if their information may have been improperly shared with Cambridge Analytica,” wrote Schroepfe.

The statement was released shortly after it was announced earlier Wednesday that Facebook CEO Mark Zuckerberg will testify before the House Energy and Commerce Committee next week on the data breach.