BBC Trending

Where does the extremist culture that inspired the Christchurch killer come from? A graphic live-streamed video and a rambling document included clues as to how the Christchurch shooter was radicalised. He used the message board 8chan to announce his attacks, which killed 50 people in the New Zealand city. And throughout his online postings are clues to how connected he was with the online culture of 8chan and a related website, 4chan. We break down the online networks used by far-right extremists to disseminate their messages under layers of irony and double meaning. And ask questions about the big social media companies, who’ve been criticised for not taking quicker action – both against the live-streamed video of the attacks and more generally against white nationalist propaganda. Is there anything that can be done online to stop similar attacks in the future? Presenters: Anisa Subedar and Mike Wendling Guests: Robert Evans, investigative journalist, Bellingcat Hussein Kesvani, UK editor, MEL magazine Annie Kelly, digital culture researcher, University of East Anglia Issie Lapowsky, senior writer, Wired magazine Ali Soufan, former FBI agent and chief executive officer of The Soufan Group Abdirahim Saeed, BBC Monitoring’s Jihadist Media Team (Photo Caption: A police officer stands guard inside an Islamic centre in New Zealand during a silence for the victims of the Christchurch attacks / Photo Credit: Getty Images)

Since the election of Donald Trump, there’s been a disturbing wave of street violence across America. The epicentre is Portland, Oregon, a place better known for its chilled out hipster lifestyle – but which has been the scene of dozens of far-right marches and rallies. Those events often result in arrests and violence. BBC Trending went there to meet two activists who have been on opposite sides of the fighting. Anti-fascist activist Luis Enrique Marquez and Rob Cantrall, member of the far-right Proud Boys group, have agreed to meet for a discussion. But will they have any common ground to bridge the political divide? Presenter: Mike Wendling Producers: Linda Sills & Natalia Zuo Editor: Jeremy Skeet (Photo Caption: A far-right protester in Portland / Photo Credit: Getty Images)

There is a disturbing new wave of political street violence in America. Groups on the far right and the far left have clashed in New York, Berkeley, California, and Charlottesville, Virginia. But one liberal enclave is the main battleground: Portland, Oregon - a progressive city in the Pacific north-west. BBC Trending has visited Portland to meet two activists who have traded insults and threats online, as well as confronting each other in the streets. What drives anti-fascist Luis Enrique Marquez? And why has marijuana farmer Rob Cantrall joined the Proud Boys, which one anti-extremism organisation has dubbed a hate group? Presenter: Mike Wendling Producers: Linda Sills and Natalia Zuo (Photo: Anti-fascist activists line up in front of police in Portland. Credit: Getty Images)

After she got a death threat, Ginger Gorman dove headfirst into the world of trolls. It all started when she wrote a light feature about a gay couple who had adopted a child. Years later, the couple were arrested on child sexual abuse charges, and although she had no knowledge of their crimes, internet trolls swarmed to attack her – even sending her and her family death threats. Where some would run away and hide, Ginger became fascinated with the world of online trolling and spent five years researching a dark and dangerous online world for a new book. Not only did she gain insight into the psyche of a troll but one notorious troll actually became her friend. But what are the implications and consequences of trolls on the people they target? And should social media companies do more about the people who post online threats on their platforms? Presenter: Anisa Subedar (Photo Caption: Ginger Gorman / Photo Credit: Ginger Gorman)

Recently, printers around the world started spewing out pages without any direction from their owners. Then a mysterious video showed up on smart TVs. Both hacks were designed to promote PewDiePie, the most popular vlogger on YouTube, in his battle to maintain subscriber supremacy against popular Indian channel T-Series. The hackers say they did it to expose the flaws and dangers in some connected devices, but they also got the attention of the YouTube star – as well as the authorities, and trolls who sent them threats. The BBC’s cybersecurity correspondent Joe Tidy tracked down the hackers and joins us in the studio to tell us what he found out. After the pranks make worldwide news, the pair decided to disappear from the internet for fear of reprisals. Do they now regret hacking? Presenter: Anisa Subedar Reporter: Joe Tidy (Photo Caption: YouTuber PewDiePie / Photo Credit: Getty Images)