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A Facebook user who lets someone not on Facebook post stuff on their page, even though they aren't on Facebook themselves. They’re like a middleman with no brains.
My cousin’s ex is a Facebook Hag. She posted my cousin’s vacation pics even though he didn’t have Facebook.
My mom is a Facebook Hag. She lets my dad post his rants about the mailman on her page.
My teacher is a Facebook Hag. She posted my bad test score on her page for my whole class to see.