What power do advertisers have over publishers? Paperchase has apologised for a promotion offered in the Daily Mail. The stationery retailer backtracked after being targeted on social media by campaigners. Stop Funding Hate believes that an advertising boycott can change the editorial stance of newspapers they disagree with. Donald Trelford was the editor of The Observer from 1975 to 1993. His new autobiography is called Shouting In The Street. Mashable has reportedly been sold for $50m, just a fifth of how much it was valued at last year. Buzzfeed and Vice are also expected to miss revenue targets for the year. As advertisers now concentrate their spending on Google and Facebook, do some digital publishers have an unsustainable business model? Will consolidation in the industry mean reduced choice for consumers? Presenter: Amol Rajan Producer: Richard Hooper.