But now the two web giants are under pressure over another kind of fakery - fake advertising.
On this week's Tech Tent we hear about the advertising industry's mounting anger over a problem that is damaging its credibility with its clients. When advertising began to move online, there was the promise of much better targeting and much more accurate measurement of how well a marketing message performed.
Instead all sorts of issues, from bots that generate phony views of ads to the placing of advertisements next to unsuitable content, have shaken confidence in the industry.
