Facebook,
Twitter and YouTube could be slapped with multimillion-pound fines for failing to remove extremist and criminal content under plans by the UK and France.
Online radicalisation will be a top priority during the Prime Minister's visit to Paris on Tuesday, in which she will hold talks with new President Emmanuel Macron.
As part of new laws to be drawn up by the two leaders, tech giants face being hit with large financial penalties if they allow unacceptable content such as terrorist propaganda.
BBC News.