In his first public comments since the scandal was exposed, Mark Zuckerberg, Facebook's chief executive, wrote on Facebook: "The company made mistakes, we have to do more, we have to move and execute."
Zuckerberg did not elaborate on the errors; however, he said: The social networking network intends to conduct an investigation of applications on its platform, restrict developers access to data, and provide a tool for members to facilitate access to their data on Facebook.
Zuckerberg did not offer an explicit apology for data misuse, and his plans do not indicate a significant reduction in the ability of advertisers to use Facebook data, which is the lifeblood of the company.
The scandal concerns the acquisition by British Cambridge Analytics of 50 million users of Facebook, analyzing the results, and using the results to direct ads and influence the political positions of these users.
The board of directors of Cambridge Analysta, its chief executive, Alexander Nicks, was suspended on Tuesday after a secret recording showing that his company played a crucial role in Trump's victory. But Cambridge University psychologist Alexander Kogan, who collected data from a poll, Denied on Wednesday.
"Cambridge claimed that it could tell the user everything about it, but I think the truth is not," Alexander Kogan said in an interview with the BBC on Wednesday.
Kogan, who collected the data through a Facebook survey management agency, said the social networking site and Cambridge International had used it as a scapegoat. Both companies blamed Kogan for misuse of the data.
Kogan ran a Facebook poll, and only 300,000 of the site's users responded to the Kogan questionnaire; but that enabled the researcher to communicate with friends on Facebook who did not agree to give information. This gave details of 50 million users.
On Twitter, Christopher Wiley, who blew up the scandal, who once worked for Cambridge Analytica, said he had accepted calls to testify before US and British lawmakers.
"It's a betrayal of a major secretariat," Zuckerberg told CNN. "I really regret that this is happening ... We have a primary responsibility to protect people's data."
He added that Facebook is committed to preventing interference in the US midterm elections in November and in the elections of India and Brazil.
He said he was prepared for any additional government regulations and would be happy to testify before the US Congress if necessary.
Facebook shares lost ground after the Zuckerberg publication, and closed just 0.7% higher.
The company has lost more than $ 45 billion in value in the stock market over the past three days because investors fear that any failure by major technology companies to protect personal data will lead to the release of advertisers and users and stricter regulations.