They have a serious security exploit that allows hackers to bypass 2fa by using whats app. This allows them to go in and disassociate your email from your account. This essientially gives the other person full access to all you messages and completely locks you out. The worst part of this is facebook has a terrible account recovery. You can submit a picture of your ID and still get refused access due to a alleged authenticator app you set up (i didn't). Meanwhile the hacker exploits whatsapp.
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