A phenomenon where a person's facebook pictures overestimate the appearance of said person by using only decent photos leading to crushing disappointment when meeting said person in real life.
More prevalent amongst the female population
"Did you see Becky's friend Jasmine?"
"Oh yeah, I looked up her facebook, she's pretty hot!"
"Oh no dude, you should see her in real life, she's got a real case of haleyosis."
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A phenomenon where a person's facebook leads to underestimation of said person's looks, normally through the use of poor photos. Opposite to Hayleyosis.
"Hey do you think Tom's hot?"
*Checks facebook*
"He's alright, not great I suppose"
"He doesn't take a great photo, but i promise he's hot! He's got reverse-hayleyosis!"