http://top-ten-best.in/facebook/ 17 AUGUST 2018 • 12:52PM
"Fake news" was not a term many people used two years ago, but it is now seen as one of the greatest threats to democracy, free debate and the Western order.
As well as being a favourite term of Donald Trump, it was also named 2017's word of the year, raising tensions between nations, and may lead to regulation of social media.
And yet, nobody can agree on what it is, the extent of the problem, and what to do about it. Here's everything you need to know.