I can't see how they could enforce anything involving social media unless there are public comments back and forth on each profile.
Otherwise, there are various levels of interactions on social media. Some rarily use their accounts or post comments, so therefore may not feel the need "unfriend" a df one.
I imagine it could get pretty messy trying to police social media interactions. What if someone forgets there password and can't access their account and remains "friends" with a df one, will they have to explain?