If you, like me, live in the EU, Facebook is now entirely clamping down and forcing free users to make their personal data available for monetization.
Attempting to access any Facebook domain and perhaps also other meta products will redirect you to the following prompt with a choice between either accepting the monetization of your user data, or coughing up a region-dependent monthly subscription fee: base (for me ~10€) + an additional fee (~7€) for each additional facebook or instagram account you have.
Now, the hidden third option. At an initial glance, it seems like there is no other option but to click one of the buttons - however, certain links still work, and grant access to important pieces of functionality through your web browser.
If anyone has information to add regarding Facebook or Instagram, please do share it. I've only (begrudgingly) used the former up until now, but I know many others use Instagram and don't feel like giving a single cent (nor their personal info) to Meta.
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https://www.facebook.com/dyi - perhaps most important of all, now is a good time to make a request to download your Facebook data. Don't forget to switch to data for "all time" and "high quality" if you intend to permanently delete your account.
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https://www.facebook.com/your_information - here you can find and manage your information, but crucially also access Facebook messenger.
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The messenger app: Still hasn't prompted me with anything, though I expect that will change in the not too far future.
Currently my plan is to use messenger to inform any important friends that I intend to leave FB, and where they'll be able to reach me in the future.
WhatsApp is truly end-to-end encrypted using the signal protocol. The same protocol Signal uses (believe it or not). Meta truly cannot read your messages. But they CAN see who you are messaging, how often you message them, when you are messaging them, where you are when you message them, and plenty more. They can collect metadata. Metadata is the data they actually care about. Honestly, it doesn't matter as much if you're asking your friend if they want to hang or sending nudes. The metadata is what they want, and it's exactly what they're collecting.
Just because it is end to end encryption, doesn't mean one of those ends can't send those messages to Facebook (also end-to-end encrypted).
Assuming they didn't pervert the signal protocol, then they really really cannot access your messages, even if they wanted to. The encryption key would only be stored on the local device. Though, it would honestly benefit them to actually do this. They then cannot provide user data to law enforcement no matter how many warrants there are, they cannot be susceptible to rogue employees stealing the information, and the list goes on. And like I said, they really don't need to know what your messages say. They get all the information they want from the metadata.