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1. Facebook Hot
A girl or boy who you have never met, looks attractive on facebook or on any other social network, but in real life when you finally meet them, you think wow that person is not attractive at all and has disgusting characteristic. Facebook pretty shows that pictures can be deceiving.
Ah, dude this girl pictures on facebook was hot but when i saw her in person, she had all this acne on her.

I'd totally do her facebook body, but not her real body.

"How come you called that date off with that boy?"
"He's nice, and he had a facebook hot picture, but in real life he's not.
2. Facebook Hot
When someone looks good on Facebook, but looks like crap in real life.
Jim: Man, that Jen girl is hot!

John: Nahh, she's only Facebook Hot man.
3. Facebook hot
The act of looking only attractive on Facebook. People are Facebook hot by severly editing pictures.
Gina: That guy was so hot!
Tina: Nah, he's Facebook hot. I saw him in person and he was ugly.
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