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Looking at your friend's Facebook and then looking at their friends just to see if they're better than you. Usually done when you're too lazy to do anything but hate on people.
I clicked on my friend's profile just to see if his friend was better than me. He wasn't. I still hate him.
She looked at my ex's profile and then at his friends. Now she's mad at me and my ex.
He checked out my friend's profile and then his friends. Now he's bragging about how they're all worse than him.