Algeria is a nation in flux - and it has become an information battleground. In February this year, thousands came out onto the streets to protest against President Abdelaziz Bouteflika's decision to run for a fifth term in office. He eventually resigned, but the demonstrators have continued to press for change.

Protesters have been using social media to keep up the momentum, but a campaign of disinformation threatens to stop them in their tracks. A flurry of fake news stories has been spreading online, while pro-government trolls have tried to shape the online conversation.

Opposition figures have accused the regime of deploying such tactics - but what do we really know about this faceless online army? We delve into a world of online lies and rumours and meet the volunteers helping Algerians distinguish fact from fiction.

Presenter: Marco Silva

(Photo: An Algerian protester shouts slogans during a demonstration in Algiers on 1 May. Credit: Getty Images)

Some believe red mercury is a mystical elixir with magical healing powers that has survived from the time of the pharaohs in ancient Egypt.

Others fear that it is a dangerous nuclear material, which in the wrong hands could bring about the apocalypse.

However, red mercury doesn’t actually exist. So why is it being offered for sale on social media?

We go in search of the many amazing lives of this mysterious mythical material.

Presenter: Mike Wendling

(Photo Caption: Illustration of a red splodge / Photo Credit: Getty Images)

How do Chinese social media users navigate government censorship?

Months of unrest in Hong Kong have caused concern in mainland China, where news about the pro-democracy protests has been carefully filtered out of social media.

It’s common for social media companies in China to remove content that is perceived to be threatening to social stability or the ruling Communist Party.

Beijing-based journalist and writer Karoline Kan delves into a world of forbidden words and state-sanctioned influencers.

Presenter: Marco Silva

(Photo Caption: Illustration of a man pulling the Chinese flag over another person’s mouth / Photo Credit: BBC)

When it became clear Samantha couldn’t give birth to her own children, she and her husband decided to look on social media for pregnant women who wanted to give their babies up for adoption.

They got a message from a young woman, who said she was heavily pregnant and wanted them to adopt her child. The couple couldn’t believe their luck. But what followed was more than a month of emotional turmoil.

They had fallen prey to a scammer who had promised babies to lots of couples she found on Instagram.

We investigate the web of lies and deceit spun by the scammer and explore the emotional toll it took on dozens of hopeful parents.

War-torn countries are having their cultural heritage destroyed with antiquities being looted and sold to generate money. In some cases, the plunder may constitute a war crime.

Instability in countries like Syria means some people are taking desperate measures to survive, but some looters have connections to criminal gangs, the Syrian government and terrorist organisations.

How has this trade moved online and what is being done to prevent the destruction of cultural heritage?

Presenter: Mike Wendling

(Photo Caption: An April 2019 picture of the adorned arc at the 5th century basilica in Syria's Qalb Lozeh village in the north-western province of Idlib / Photo Credit: Omar Haj Kadour/AFP/Getty Images)

Have you ever wondered what would happen to humanity if we all stopped having babies? The extinction of the human race may be a scary thought to most of us, but not for the “anti-natalists”.

They’re a thriving online community based on Facebook and Reddit that firmly believes human life only brings suffering and should therefore come to an end.

While some entertain the idea on a purely philosophical level, others say reducing the number of people on Earth is an imperative to combat climate change.

So what exactly motivates the anti-natalists? And how seriously should we take some of their rather controversial views and arguments? We have been following their conversations online and spoken to a number of anti-natalists who want a worldwide birth stop now.

Presenter: Mike Wendling

(Photo: Red ban sign over baby's picture. Credit: Getty Images)

YouTube has been criticised for failing to take responsibility for videos posted on the platform. So can it be trusted to control potentially harmful content?

The video-sharing site is just 14, but there's no doubt it has become a giant of global communication. According to the company's own figures, it has more than a billion users around the globe, watching more than a billion hours of videos every day.

At the same time as it has grown phenomenally popular, however, YouTube has also been accused of spreading conspiracy theories and radicalising people into violent extremism. It has also been blamed for allowing hate speech, while failing to protect users from harmful videos.

And so it's only fair to ask: can YouTube really be trusted? In a rare interview with the BBC, YouTube UK managing director Ben McOwen Wilson gives us a glimpse into the company’s thinking about the many challenges and controversies it has faced in recent months.

Presenter: Marco Silva

(Photo Caption: a laptop showing YouTube's logo on its screen is held in front of graffiti / Photo Credit: Getty Images)

What does the QAnon conspiracy theory tell us about American politics today? It’s a sprawling set of allegations which has a number of branches and offshoots –but if one thing unites its believers, it’s that they all support President Trump.

Presenter: Mike Wendling

(Photo Caption:: A QAnon supporter holds up a sign outside a rally for President Donald Trump / Photo Credit: Getty Images)

Many people who believe the Earth is not round first heard the idea on YouTube.

While it’s hard to accurately say how many flat Earthers there are worldwide, it is undeniable that their community has grown in recent years. Flat Earth meet-ups and conventions have popped up in a number of countries, while online searches for the topic have reached unprecedented levels.

YouTube hosts thousands of flat Earth videos, some with millions of views. And when you ask flat Earth conspiracy theorists how they got into the movement, they almost always say their introduction came via the world’s most popular video-sharing site. It was on YouTube that many were persuaded to reject centuries of solid science and where they found like-minded people to share their views with.

YouTube says it's taking action to address the proliferation of misinformation and conspiracy theories on their platform. The Google-owned company says it’s trying to limit the spread of flat Earth videos (albeit only in the United States so far) and is taking steps to insert factual information among the conspiracy content.

But is it all just too little, too late?

Presenter: Mike Wendling

(Photo: 3D illustration of a flat earth model/ Photo credit: Getty Images)

Growing up, Dina – not her real name – would browse social media and imagine a life far from the one she was living. She felt shackled by the rules imposed on her by her parents, religion and the culture of the United Arab Emirates.