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A condition in which a person cannot resist the urge to comment and like Facebook posts of others. A condition often seen in older people who are new to Facebook and most often occurring in parents who like and comment on every single thing their children put on Facebook.
My mom has a bad case of postillitis. I put 56 pictures on Facebook from our trip and my mom liked every single one of them.
by badkarma6 January 03, 2015
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