In addition, the 87 million users who might have had their data shared with Cambridge Analytica will get a more detailed message informing them of this.
The social media giant said it now plans to make the "unsend" feature available to all users.
Some of the information improperly harvested from Facebook Inc. users might be stored in Russian Federation, said the former employee of Cambridge Analytica who blew the whistle on the data-privacy scandal involving the analytics firm's role in the 2016 presidential election. The Faceblock campaign has been planned to coincide with Mark Zuckerberg's appearance before US Congress on Wednesday, where the Facebook chief executive will be testifying about data privacy issues.
Cambridge Analytica says it only ever received data on 30 million users.
That Facebook app called This is Your Digital Life was a personality quiz created in 2014 by an academic researcher named Aleksander Kogan, who paid about 270,000 people to take it.
Facebook confessed to TechCrunch that they have been doing this for a while.
Facebook later limited the data that apps can access, but it was too late in this case.
Zuckerberg is known to have a team that helps him run his Facebook profile, with some special abilities for managing his 105 million followers and constant requests for his attention.
Christoper Wylie said it was hard to verify how many people had access to the Facebook information.
SCL is Cambridge Analytica's parent company. Hearings over the issue are scheduled in the USA, and the European Union is considering what actions to take against the company. "It is often the only source of news in some places", she said.
Facebook executive Sheryl Sandberg told NBC's Today show that Facebook should have conducted an audit after learning that Cambridge Analytica had improperly accessed user data almost three years ago.
Reports also surfaced detailing AIQ's alleged ties to Cambridge Analytica, and to the U.K.'s Vote Leave campaign during the Brexit referendum.
The party said they had launched a review to ensure no voter data had been misused.
Facebook is trying to strengthen its system ahead of this year's USA midterm elections as well as upcoming elections around the world.
Facebook will require every such advertiser to confirm their identity and location. The issue ads requirement is new. The company did not say what this number would be.
Another issue facing Facebook may be keeping its advertisers happy. This is similar to how Airbnb and other services verify addresses.
Facebook users can opt out of seeing targeted ads, but can't shut off ads altogether.
Facebook has said the data was initially collected by a professor for academic purposes in line with its rules.
However, Facebook may have also looked to thwart the publication of potentially embarrassing personal messages sent by Zuckerberg or other executives.
"Facebook has also become a platform for community organising, so why should those people have to suffer because of bad policies of a company?"
However, Facebook never publicly disclosed the removal of messages from users' inboxes, nor privately informed the recipients. Facebook executives took almost five days to respond to the Cambridge Analytica reports. For example, would all traces of the deleted message disappear, allowing users to send abusive messages that they could simply "unsend" later?
"I think that Facebook is a platform that has the scale of 2 billion users".