In the first episode of this new series, BBC Trending and a team of disinformation reporters will investigate how hardcore anti-vaccine activists have used social media to spread their message far and wide, capitalising on fear and mistrust to advance their own agendas.

We’re not talking about legitimate medical debate or questions that people have about the safety and effectiveness of vaccines. No, we’re talking about completely debunked conspiracy theories – that the vaccines contain microchips in order to track everyone who takes them, that they will make you infertile or are poisonous, or that they will alter your DNA.

Exclusive research by BBC Monitoring shows just how popular far anti-vaccine material has spread on Facebook and Instagram. With the help of some of the world’s leading researchers, we investigate how these posts increase vaccine hesitancy and find out how some fringe activists are turning their online efforts into real-world action.

Presenter: Mike Wendling