So millions of Facebook users have had their data illegally harvested by a London-based political consultancy group, Cambridge Analytica.

The company is believed to have used the data to influence the 2016 US presidential election.

When the story broke, it was estimated that the company harvested about 50 million Facebook user's data. But new revelations from Facebook indicate that the numbers were far higher - an estimated 87 million Facebook users.

Facebook is already reeling from an escalated privacy scandal.

On Wednesday, the social media giant said the personal information of the up to 87 million people were mostly of users in the United States.

Chief Executive Mark Zuckerberg said in a conference call with reporters that Facebook had not seen “any meaningful impact” on usage or ad sales since the scandal, although he added, “it’s not good” if people are unhappy with the company.

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Facebook shares rose more than 3% after the bell.

Zuckerberg told reporters that he accepted blame for the data leak, which has angered users, advertisers and lawmakers, while also saying he was still the right person to head the company he founded.

“When you’re building something like Facebook that is unprecedented in the world, there are going to be things that you mess up,” Zuckerberg said, adding that the important thing was to learn from mistakes.

He said he was not aware of any discussions on the Facebook board about him stepping down, although directors would face a challenge if they wanted to oust him because Zuckerberg is the controlling shareholder.

He said he had not fired anyone over the scandal and did not plan to. “I’m not looking to throw anyone else under the bus for mistakes that we made here,” he said.

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