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That's very neat and really glad to see privacy enhancing technologies working.

I'm curious what type of metadata Facebook would have from the signal integrations with Whatsapp and Messenger. Is there more, less, or same? Has anyone looked in to this?

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Quite recently Whatsapp started to share your phone name and last time you were on the service with Facebook AFAIK https://www.cnet.com/how-to/how-to-stop-whatsapp-from-sharin...

Significantly more; OWS in this blog post are claiming to keep the very bare minimum.

Whatsapp and Facebook, meanwhile, are sharing data to improve ads - surely they share much more than that with LE.

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