Fake news is not only news that you disagree with. It can also very closely mimic real news stories.
Technology reporter Zoe Kleinman explains.
This is part of a series by the BBC on disinformation and fake news – a global problem challenging the way we share information and perceive the world around us.
To see more stories and learn more about the series visit www.bbc.co.uk/fakenews
What is fake news and how can you identify it?