Facebook has introduced a new tool to help users spot fake news stories.

From Thursday, a new prompt will appear at the top of users' news feeds called "How to spot false news", offering advice on how to recognise fake news articles and prevent them from spreading.

The 10 tips for spotting fake news are:

Adam Mosseri, the social network's news feed boss, said: "We know people want to see accurate information on Facebook - and so do we.

"False news is harmful to our community, it makes the world less informed, and it erodes trust.

"It's not a new phenomenon, and all of us - tech companies, media companies, newsrooms, teachers - have a responsibility to do our part in addressing it."

Facebook said it had worked with news literacy and fact-checking organisations, including Full Fact in the UK, to create the new guidance.

Full Fact's Director, Will Moy, said: 'Nobody wants to mislead their friends, and this is a great chance to remind people: if you're not sure, don't share.

"Today's announcement is welcome.

"We hope that Facebook will also recognise how much more they can do to make it easier for users to spot false news online.

"The launch of this educational campaign is useful and timely but it should just be the start."

Facebook's latest announcement comes after founder Mark Zuckerberg defended his site following the US election in November when it was claimed by some that the presence of fake news stories surrounding Hillary Clinton and Donald Trump could have influenced some voters.

"Of all the content on Facebook, more than 99% of what people see is authentic," Mr Zuckerberg said.

"Only a very small amount is fake news and hoaxes.

"That said, we don't want any hoaxes on Facebook. Our goal is to show people the content they will find most meaningful, and people want accurate news.

"We have already launched work enabling our community to flag hoaxes and fake news, and there is more we can do here."

Facebook said it was also said it was taking steps to make it more difficult for those posting fake news stories to purchase adverts on the site.