Why is smoking not looked at as a spiritual danger? Once it became assur to smoke it became spiritually dangerous as well.
And this is logical. If someone knows it is assur to smoke but does so anyway, then this probably reflects a deeper problem with his connection to halacha.
I don’t know so much about facebook but as far as I understand it doesn’t present a physical danger as well as a spiritual one as does smoking.
I would say bari v’shema bari adif. Or garu’ah in this case.