This is absolutely not true and would immediately trigger lawsuits across the globe. WhatsApp and Meta data separation is extremely strict. Source: I work at WhatsApp and also https://faq.whatsapp.com/1303762270462331
> We need your contacts to provide the service, but don’t share your contacts with Meta.
Under "How We Work With Other Meta Companies" in the privacy policy describes a usage almost identical to what the parent suggests:
> improving their services and your experiences using them, such as making suggestions for you (for example, of friends or group connections, or of interesting content), personalizing features and content, helping you complete purchases and transactions, and showing relevant offers and ads across the Meta Company Products;
I would be very careful about making such statements.
It is absolutely true that WhatsApp collects your contacts' phone numbers and your social graph. Unless WhatsApp has stopped doing that, in which case it should make a big announcement.
I don't know if the social graph is used outside WhatsApp, so that part may not be true, but it is within the privacy policy to do so (at least the one I see, EU may have a different one), the privacy policy says WhatsApp may share information with Meta to among other things:
> improving their services and your experiences using them, such as making suggestions for you (for example, of friends or group connections, or of interesting content), personalizing features and content, helping you complete purchases and transactions, and showing relevant offers and ads across the Meta Company Products;
And there have been waves of policy updates, notifications etc specifically to get these terms. That doesn't mean Find my Friends gets this information, but I thought there was at least discussion of it.
> We need your contacts to provide the service, but don’t share your contacts with Meta.
I'm frustrated that people even at HN allow themselves to indulge in conspiracy theories that would be immediately whistle-blowed or reported on. There are thousands of people that work on or with WhatsApp and related products within Meta who would notice, not to mention all the data separation audits that happen.
> We need your contacts to provide the service, but don’t share your contacts with Meta.
There are plenty of ways to make this statement 100% factual and still effectively leak the user's address book, at least in a form useful to Meta. It is true that Meta doesn't need your raw contacts, it just needs certain inferences made from them. WhatsApp can perfectly well make those inferences and only share those, with some trivially-reversed "anonymization" on top as an extra layer of obfuscation.
Your company has been knowingly in breach of the GDPR since it went into effect and shows no signs of stopping despite multiple adverse rulings and fines. There is no reason to trust a company whose entire business model is based on breaching privacy regulations and lying about it.
What you're saying is either an outright lie you are telling us, or a lie you have been told and are yourself choosing to believe to feel better about working for them, or to not put yourself at risk by digging deeper and finding adverse information (which once you know it you may be required to blow the whistle or find yourself legally complicit in the matter).
Basic economics suggests there is no reason Meta (then-Facebook) would pay what it had paid for WhatsApp for "just" a messaging app, especially before it was as entrenched as it is now (and so could trivially be dethroned by Facebook's own offering). They did so because unlike Facebook, people trusted WhatsApp with access to their contacts and that information is extremely important for Meta.
Whatsapp has been audited several times, and to say that an engineer at meta “has been lied to” is laughable given he/she has access to the entire codebase
Source: also worked at meta and had full access to WhatsApps codebase, like most engineers at meta
A conspiracy involving thousands of people lying and no one speaking up over many years (it's been over 9 years since the acquisition) is incredibly unrealistic. Your hypothesis that WhatsApp shares the addressbook with Meta is not at all probable.
> We need your contacts to provide the service, but don’t share your contacts with Meta.