More than 2 million people have shared, commented on and reacted to a story that former president Barack Obama had signed an executive order banning schoolchildren from taking the pledge of allegiance.

The story is – as many of you readers will have guessed – completely untrue.

It was first posted on a site called ABCNews.com.co – a fake site made to look like ABC News. And it has the dubious distinction of being the most widely shared piece of fake news last year, according to BuzzFeed.

Meanwhile, during last year’s US election campaign, fake news was circulated almost 40 million times according to research from Stanford University, including claims that the Pope had endorsed Donald Trump and the terrorist group Daesh had endorsed Hillary Clinton.

Now Italy, facing elections of its own next year, has taken a preemptive strike against the spread of fake news through its education system.

“Fake news drips drops of poison into our daily web diet and we end up infected without even realizing it,” said the Italian politician Laura Boldrini who is spearheading a project with the Italian Ministry of Education to teach school children how to spot fake news.

“It’s only right to give these kids the possibility to defend themselves from lies,” she told the New York Times.

Image: IFLA

The initiative will be rolled out in 8,000 high schools across the country, with students encouraged to examine the sources, verify facts and flag up fabricated stories to the relevant authorities.

Some fake news hoaxes – you can charge an iPhone by popping it in the microwave, for example – should be easy to spot if students are taught to check sources rather than just skim read and to think twice (or maybe just once) before sharing an article.

But the dark arts of disseminating misinformation are increasingly sophisticated and, in the case of Russian interference in the US election, require an FBI investigation rather than a lesson at school to untangle.

Politics is especially susceptible to persistent, coordinated and well-disguised campaigns which spread fake news.

The deliberate spreading of false information has played its part in the UK’s referendum on whether to stay in the EU, the upcoming elections in Kenya and the animosity between presidential candidates Marine le Pen and Emmanuel Macron in France.

In fact, it is only in countries with strict internet censorship where fake news is not expected to enter the fray of daily politics.

Politicians often complain about being the victims of fake news.

The Spanish foreign minister told the BBC that many of the pictures showing police violence against Catalan voters were fake news. And US President Donald Trump is consistent in his criticism of the media for spreading fake news.

Image: Twitter

But that in turn causes some people to worry that politicians themselves could use the existence of fake news to get rid of inconvenient stories.

Social media firms such as Facebook and Twitter are grappling with how to police the content of their sites. And governments around the world are wrestling with how to legislate against it.

But while training schoolchildren to try to spot it may be a good start, fake news stories aren't likely to disappear anytime soon.