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Media captionDamian Collins, the committee's chairman, says “sophisticated” fake news is causing a “crisis for democracy”

The volume of disinformation on the internet is growing so big that it is starting to crowd out real news, the Commons Digital, Culture, Media and Sport Committee chairman has said.

Tory MP Damian Collins said people struggle to identify “fake news”.

MPs in their committee report said the issue threatens democracy and called for tougher social network regulation.

The government said it plans to introduce a requirement for electoral adverts to have a “digital imprint”.

This would mean that all political communications carried online would need to clearly identify who they were published by.

Labour said the government “needs to wake up to the new challenges we face and finally update electoral laws”.

The report follows the Cambridge Analytica data scandal earlier this year.

The London-based data analytics firms and tech giant Facebook were at the centre of a dispute over the harvesting and use of personal data – and whether it was used to influence the outcome of the US 2016 presidential election or the UK Brexit referendum.

Both firms deny any wrongdoing.

Arron Banks, the businessman who was the chief backer of the unofficial Leave.EU campaign, donating millions of pounds, was criticised for misleading the committee about his business dealings with Russia and for failing to demonstrate the source of the money.

Vote Leave broke electoral law, says Electoral Commission Vote Leave's targeted adverts revealed Cambridge Analytica ‘planted fake news' The not so brief history of fake news Cambridge Analytica: The story so far Media caption A brief history of fake news Image caption Facebook founder Mark Zuckerberg has been asked to give evidence to the committee