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> WhatsApp and Messenger content. (emphasis mine)

Isn't WhatsApp supposed to be end-to-end encrypted making it next to impossible even for developers (Facebook Inc. in this case) to access the transmitted messages' content?

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Wasn't it WhatsApp that sent a key back to Facebook servers? Technically it's end-to-end encrypted, but Facebook could decrypt it if they really wanted to.

Do you have a source for this claim?

It does not sound correct.

What use is it being end-to-end encrypted if, for all you know, they store the keys, or even decrypt and store all contents on their servers...

It's decrypted on my phone in their app. Theoretically, what stops them from connecting to my phone and reading the decrypted content from there?

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