Parts of Brazil's Amazon rainforest are being illegally sold on Facebook, the BBC has discovered.
The protected areas include national forests and land reserved for indigenous peoples.
Some of the plots listed via Facebook's classified ads service are as large as 1,000 football pitches.
Facebook said it was "ready to work with local authorities", but indicated it would not take independent action of its own to halt the trade.
"Our commerce policies require buyers and sellers to comply with laws and regulations," the Californian tech firm added.
The leader of one of the indigenous communities affected has urged the tech firm to do more.
And campaigners have claimed the country's government is unwilling to halt the sales.
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"The land invaders feel very empowered to the point that they are not ashamed of going on Facebook to make illegal land deals," said Ivaneide Bandeira, head of environmental NGO Kanindé.
No certificates
Anyone can find the illegally invaded plots by typing the Portuguese equivalents for search terms like "forest", "native jungle" and "timber" into Facebook Marketplace's search tool, and picking one of the Amazonian states as the location.
Some of the listings feature satellite images and GPS co-ordinates.
Many of the sellers openly admit they do not have a land title, the only document which proves ownership of land under Brazilian law.
The illegal activity is being fuelled by Brazil's cattle ranching industry.
'No risk'
Deforestation in the Brazilian Amazon is at a 10-year high, and Facebook's Marketplace has become a go-to site for sellers like Fabricio Guimarães, who was filmed by a hidden camera.
"There's no risk of an inspection by state agents here," he said as he walked through a patch of rainforest he had burnt to the ground.
With the land illegally cleared and ready for farming, he had tripled his initial asking price to $35,000 (£25,000).
Fabricio is not a farmer. He has steady middle-class job in a city, and views the rainforest as being an investment opportunity.
The BBC later contacted Fabricio for his response to its investigation but he declined to comment.
Going undercover
Many of the ads came from Rondônia, the most deforested state in Brazil's rainforest region.
The BBC arranged meetings between four sellers from the state and an undercover operative posing as a lawyer claiming to represent wealthy investors.
One man, called Alvim Souza Alves, was trying to sell a plot inside the Uru Eu Wau Wau indigenous reserve for about £16,400 in local currency.
It is the home to a community of more than 200 Uru Eu Wau Wau people. And at least five further groups that have had no contact with the outside world also live there, according to the Brazilian government.
But at the meeting, Mr Alves claimed: "There are no Indians [sic] there. From where my land is, they are 50km [31 miles] away. I am not going to tell you that at one time or another they are not walking around."
The BBC showed the Facebook ad to community leader Bitaté Uru Eu Wau Wau.
He said the lot was in an area used by his community to hunt, fish and collect fruits.
"This is a lack of respect," he said.
"I don't know these people. I think their objective is to deforest the indigenous land, to deforest what is standing. To deforest our lives, you could say."
He said the authorities should intervene, and also urged Facebook - "the most accessed social media platform" - to take action of its own.
Changed status
Another factor driving the illegal land market is the expectation of amnesty.
Mr Alves revealed he was working with others to lobby politicians to help them legally own stolen land.
"I'll tell you the truth: if this is not solved with [President] Bolsonaro there, it won't be solved anymore," he said of the current government.
A common strategy is to deforest the land and then plead with politicians to abolish its protected status, on the basis it no longer serves its original purpose.
The land grabbers can then officially buy the plots from the government, thereby legalising their claims.
