Warnings of a 'mortgage bomb' about to blow up; Australia puts big tech' under more pressure; Mary Holm's 25 years with readers and writers.

Mediawatch looks at reports of a 'mortgage bomb' that could blow up the economy.

Also - new moves to make Google and Facebook pay the media for the news they distribute - and who is the country's longest-lasting columnist

Go to this episode on rnz.co.nz for more details