Do we have established terms yet for persons either addicted or averse to social media?
Solution 1:
A fan of technology might be called a technophile.
The opposite would be called a technophobe.
For the latter, the term Luddite also comes to mind.
Solution 2:
I think that a person averse to social media can be called social media (networking) phobic while its opposite can be defined as social media (networking) addicted.