> I suspect that account credentials acquired from breaches of non-Facebook services are being used to attempt to access Facebook accounts.
Given you more or less gave away the idea that you reuse your own passwords, if you haven't already, I suggest you start using a password manager and changing all your passwords to something random.
Given you more or less gave away the idea that you reuse your own passwords, if you haven't already, I suggest you start using a password manager and changing all your passwords to something random.