Facebook said it would begin notifying users Monday if their data has been swept up in the Cambridge Analytica scandal, although it appears to be taking its time.

The 87 million users who might have had their data shared with Cambridge Analytica were supposed to get a detailed message on their news feeds starting on Monday. Facebook says more than 70 million of the affected users are in the US, though there are over a million each in the Philippines, Indonesia and the UK, and up to 311,000 in Australia.

As of 8.30pm Eastern time, however, there were no signs that any users have yet received that notification or a more general one Facebook said it would direct to everyone on its service. Associated Press reporters around the world have been surveying users, none of whom have reported seeing anything from Facebook. There appear to be no social media reports of notifications, and Facebook had no immediate comment on the matter.

Reeling from its worst privacy crisis in history - allegations that this Trump-affiliated data mining firm may have used ill-gotten user data to try to influence elections - Facebook is in full damage-control mode. CEO Mark Zuckerberg acknowledged that he made a "huge mistake" in failing to take a broad enough view of what Facebook's responsibility is in the world. He's set to testify before Congress on Tuesday and Wednesday.

In prepared remarks released by a House committee, Zuckerberg said the company had notified all users affected in the scandal. Since the remarks are for Wednesday morning, this means everyone who was affected should see a message by then.