Facebook to contact 87 million users affected by data breach

Message will reveal which users had personal information was harvested by Cambridge Analytica

Eighty-seven million Facebook users around the world will find out on Monday if their details were shared with Cambridge Analytica in one of the social network's largest data breaches.

The firm said affected users would receive a detailed message on their news feeds. The majority of those whose information was shared with the data analytics firm - about 70 million - are in the US.