Social media companies fail to crack down on scammers who sell people's personal details through their platforms, a consumer watchdog survey Which? showed.
He found 50 profiles, pages and groups on Facebook, Twitter and Instagram that offer details of stolen credit cards and Netflix and Uber Eats accounts.
And much of the content remained on the platforms after being reported.
Facebook and Twitter said that this activity was not tolerated and would have been removed.
The investigation, conducted before the coronavirus blockade, found a Facebook post that reveals a Yorkshire man:
- name and surname
- date of birth
- address
- cellphone number
- credit card number, security code and expiration data
- bank name and ordering code
According to Which?, The post had been live for four months.
Which? he said he reported it to Facebook, but the social network refused to remove it because it didn't violate his community's standards.
Only after which? he had requested a review of that decision if the post had been removed - and, even then, the group in which it had been published had remained active.
In response, Facebook, which also owns Instagram, told BBC News that it had taken action to delete all content.
"Fraudulent activity is not tolerated on our platforms and we have removed the groups and profiles reported by Quali? ... for violation of our policies."
"We continue to invest in people and technology to identify and remove fraudulent content and urge people to report any suspicious content to us in order to take action."
Scam tactics
On Twitter, investigators found scammers offering:
- full credit card details of a person with a "£ 13,000 plus balance" for £ 100 - or three sets of card details for £ 200
- a fake passport for £ 3,000
Which? he claimed to have found the content simply by looking for slang terms for fraud.
And Twitter's algorithms had also suggested similar accounts via its "Who to Follow" section.
Twitter said it was against its "use scam tactics to get private money or financial information" rules.
"Where we identify violations of our rules, we take solid control actions," he said.
"We constantly adapt to the evolving methods of bad actors and will continue to iterate and improve our policies as the industry evolves."
All accounts provided by Which? now they have been suspended.
Which? Money publisher Jenny Ross said, "It is surprising that social media sites make it so easy for criminals to exchange personal and financial information about people, particularly because fraud is such a widespread crime that it can have devastating consequences."
He called on Facebook and Twitter "to take more incisive measures to prevent their sites from becoming a safe haven for scammers" and "to collaborate with the financial industry and the police to deal with serious flaws with their platforms".
