The woman taking on trolls on their own turf

The Philippines is playing a key role in the wave of disinformation sweeping the world. So-called troll farms are being used to create multiple fake social media accounts that post political propaganda and attack critics. But a group of people calling themselves the Troll Patrol are trying to use their own tactics against them, as the BBC's Howard Johnson reports.

In 2016, Gina - not her real name - and others, watched with alarm as a group of Catholic schoolgirls in the Philippines came under attack from online trolls.

The girls had been filmed and photographed standing on a street in the capital Manila in their uniforms, chanting: "Marcos is no hero! Marcos is no hero!"

They were angry that former Philippine dictator Ferdinand Marcos had just been buried in a nearby hero's cemetery with military honours.

In the 21 years he ruled, billions of dollars of public money went missing while thousands were arrested and tortured for opposing his regime.

But his family have remained both politically influential and popular and are closely aligned to the current President Rodrigo Duterte.

Within hours of the photos being posted on the school's Facebook page, and then widely reshared, comments began to appear defending the Marcos legacy and attacking the girls' actions. Some of them were from genuine accounts, but many were from pro-government trolls using fake accounts.