Facebook, Amazon and Google have “unprecendent” data breaches that could breach the UK’s data protection legislation, a watchdog has said.
The National Data Protection Authority has written to Google and Facebook asking for a “timely, comprehensive” response.
The regulator is concerned that the companies’ “unanticipated and disproportionate” breaches of data protection laws could lead to a “significant impact” on consumers.
The watchdog also wants the companies to make “urgent and detailed” changes to their business models.
The companies have previously been accused of over-reaching by the regulator.
In September, Facebook admitted that it had breached EU data protection rules in relation to its Facebook Marketplace service.
It is currently being investigated by a court in the Netherlands.
Google, meanwhile, admitted it had been breached by its European data protection watchdog in June 2017.
The company has apologised and paid €1m (£1.5m) in fines and costs.
Facebook also admitted it was breaching data protection law in October 2017, when it disclosed that it was storing people’s personal information for a second time.
However, the company has yet to respond to the NDA’s complaint.
Facebook and Google are owned by Google parent Alphabet.