The social networking website has come under enormous pressure from government and campaign bodies over recent weeks after news of the issue first emerged, and Facebook has confirmed that it will inform those users affected by the situation via their news feed later today (09.04.18).
The vast majority of those affected by the breach are based in the US, although more than one million people in each of the UK, Philippines and Indonesia could also have had their personal information harvested.
In total, Facebook has as many as 2.2 billion users all around the world, with each and every one of them set to receive a notification titled 'Protecting Your Information', which will explain what information, if any, has been shared.
Cambridge Analytica whistleblower Christopher Wylie has claimed that up to 87 million could have had their personal details compromised by the situation.
He told NBC: "I know that Facebook is now starting to take steps to rectify that and start to find out who had access to it and where it could have gone, but ultimately it's not watertight to say that, you know, we can ensure that all the data is gone forever."
Meanwhile, in an interview last month, Christopher explained what Cambridge Analytica was doing behind the scenes.
He shared: "We exploited Facebook to harvest millions of people's profiles. And built models to exploit what we knew about them and target their inner demons.
"That was the basis the entire company was built on."