Face but no head
A person so obsessed with Facebook, they’ve forgotten how to talk to real people. They’re like a robot with a face.
"She’s face but no head, spends all day on Facebook, doesn’t know how to talk to people.", @facebookaddict2021
"He’s face but no head, he’s like a robot who only knows likes and comments.", @robotfacehead
"She’s face but no head, she doesn’t even know what her real friends look like.", @realfriendkiller"