Many moons ago I purged everything I could, left a generic profile picture and barely logged in since. That way I 'own' my shadow profile and it is harder for someone to pretend to be me via a facebook account (I operate a 'plant your flag' policy for security as much as anything else on these public platforms).

Nobody is holding a gun to your head to log back in to the account any time soon. I think the last time I actually did log in was > 12 months ago.