By 2020 it is estimated that Google and Facebook may together take more than 70 per cent of the money spent on digital advertising in the UK.
This is a future which leaves little space for news publishers and other media.
Read the latest news and analysis about the Press Gazette Duopoly campaign.
Email pged@pressgazette.co.uk to point out mistakes, provide story tips or send in a letter for publication on our "Letters Page" blog
