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Constantly liking, commenting, or posting on someone's Facebook just to rub their nose in how much you think you're better than them.
I liked your post 12 times because I thought it was okay, but really I was trying to show you I’m better.
I commented on your vacation photo saying 'You're just lucky' when I was stuck at work.
I posted about my new job right after you posted about your promotion, just to make it obvious I’m better.