[Barrin92]

At least in Europe that is not true, from their official page

"We do not share data for improving Facebook products on Facebook and providing more relevant Facebook ad experiences.Today, Facebook does not use your WhatsApp account information to improve your Facebook product experiences or provide you more relevant Facebook ad experiences on Facebook. This is a result of discussions with the Irish Data Protection Commissioner and other Data Protection Authorities in Europe[...]

Importantly, WhatsApp does not share your WhatsApp contacts with Facebook or any other members of the Facebook Companies, and there are no plans to do so."

https://faq.whatsapp.com/general/security-and-privacy/how-we...

[sliq]

What they say in official text is not automatically what they actually do. Example: maybe they dont sell data to Facebook, but to a middle-man company. And this company sells to Facebook. Disclaimer texts are shady things!

[Barrin92]

that would also be illegal under GDPR. Not to mention it's a misunderstanding about how Facebook works. Facebook does not sell data at all, they sell ad-space based on their own data.

[fsflover]

> that would also be illegal under GDPR

Not a problem to Facebook: https://ruben.verborgh.org/facebook/#history

[Barrin92]

not sure what the relevance here is. That user is complaining about not getting network data from Facebook which may not be covered by GDPR, rather than his personal data he stored on the service.

However giving your data to third parties without your explicit consent is without a doubt a violation of GDPR.