If Facebook Messenger is only end-to-end encrypted if I start a secret conversation, how secure is a normal conversation?
- Can Facebook theoretically access my messages?
- Does Facebook scan the contents of my conversations for ads purposes?
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Of course they can, they can access everything and anything that is uploaded, or used on their platform. Non end-to-end communication encrypts the data between you and Facebook, and the recipient and Facebook. So Facebook sees everything. The only exception is when using end-to-end communication, when data is encrypted between you and the recipient directly and Facebook may not be able to see the messages.
[Unless in a situation where the government gets a court order to disable the end-to-end communication feature so that messages are not encrypted when using end-to-end communications even though you think it is, but I am not a lawyer nor an expert on Facebook's terms and conditions]