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Rarely used parliamentary powers were used to demand that the boss of a US software firm hand over the details.

The Observer, which first reported the story, said the documents included data about Facebook's privacy controls.

MP Damian Collins later told the BBC that he believed the documents were "highly relevant" to his inquiry. Facebook has demanded their return.

The documents were intercepted when an executive of US tech firm Six4Three was on a trip to London.

In theory Facebook could be fined if it is found to be in breach of GDPR, Europe's data protection rules.

It has not revealed whether other services which people use their Facebook log-ins for - such as Tinder and Spotify - have also been affected.

Facebook has now fixed the issue.

People potentially affected were logged out of their accounts on Friday and those definitely affected were notified.

Facebook says it has identified 50 million accounts which were certainly involved in the breach, with an extra 40 million also warned as a precautionary measure.

Traffic, which monitors such activity, said many of the species, despite having international protection, were not native to the country, and so trading them was unregulated.

The listings were found on 12 Facebook groups during one month in 2016.

Facebook said it did not allow the trade of endangered species.

Among the 200 different species listed for sale were two non-native species banned from international commercial trade - the Eurasian otter and the black spotted turtle.

The glitch set a user’s post to be shared to "everyone", even if a user had previously chosen a more restricted option, such as “friends of friends”.

“We’d like to apologise for this mistake,” said Erin Egan, Facebook’s head of privacy.

Users who may have been affected will be notified on the site’s newsfeed.

"We recently found a bug that automatically suggested posting publicly when some people were creating their Facebook posts,” Ms Egan said.

Supposedly, Fabrizio Brambilla already has his system connected to your account. And, warns the message,  if one of your friends accepts him, you will be hacked as well.

Versions of the message are circulating in Italian and English.

An example of the hoax:

"When you're building something like Facebook which is unprecedented in the world," he said on Wednesday, "there are things that you're going to mess up.

"What I think people should hold us accountable for is if we are learning from our mistakes."

As well as being Facebook's chief executive, Mr Zuckerberg is chairman of the company's board. When asked if his position had been discussed, he replied: "Not that I know of!"

The mere possibility that his leadership is in question is a scenario few would have predicted even a month ago.

The CEO's statement follows allegations that 50 million Facebook users' private information was misused by the political consultancy firm.

Mr Zuckerberg pledged to introduce a series of changes.

These would make it far harder for apps to "harvest" user information, he said.

A breach of trust between app creator Aleksandr Kogan, Cambridge Analytica and Facebook had occurred, Mr Zuckerberg said in a statement on his Facebook page - his first public comments since the scandal broke.

"Local news helps us understand the issues that matter in our communities," explained chief executive Mark Zuckerberg on his page on Monday.

The update will initially apply to the US before it is rolled out more widely.

It comes after Facebook announced that it was making posts from businesses, brands and media less prominent.

"Starting today, we're going to show more stories from news sources in your local town or city," Mr Zuckerberg said in his post.

The government press office said the page was created over the holidays without the Prime Minister's knowledge or approval, and has since been removed.

But the page made a number of bogus announcements, including a promise to increase pension payments to US$78 a month, up from $53.

The government said there were no plans to increase pension payments.

Tuilaepa said he had no plans to create a Facebook account either, saying he would not waste his time with "such silly things".

Paul Tweed said he had been "deluged" with inquiries after the settlement with the 14-year-old girl.

She sued Facebook after a man allegedly posted a naked photo of her on a so-called "shame" page.

Facebook has said it takes the issue of revenge porn seriously.

It said it has developed tools to tackle the problem.