Technology
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So either FB isn't actually E2E, or their implementation is Twitter-grade broken.
Who said facebooks private chat would be e2e?
Facebook claims to have E2E chats, but not by default. Likely these people used the default, non E2E messages.
Not that I'd trust FACEBOOK with E2E anyway.
WhatsApp claims e2e by default.
Will all the chats be gone if you switch devices?
If you restore from a backup on iOS, probably not. I’m not a WhatsApp user, but I don’t remember losing my Signal history.
By default whatsapp makes unencrypted backups. You can enable encrypted backups, but then of course if you lose the password you can't restore the backup.