Facebook Hag 

A person who Is friendly with someone who is not on Facebook, but stil agrees to post the non Facebook person’s Pictures, videos and comments on their own Facebook page for them.

“I’m not on Facebook, but I have a Facebook Hag who posts stuff for me!”

Facebook Hag by AJ Rules The School July 17, 2018

Facebookagnostic 

A person who is doubtful or non-commital about Facebook

Does Sarah Facebook? Well, sort of. She has an account, but she doesn't really use it much. She's facebookagnostic.

Facebookagnostic by AH73 May 12, 2011