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Facebook jealousy is when you see your crush or your significant other getting all lovey-dovey with someone else on Facebook and it makes you want to punch their face and delete their account.
I saw my ex posting selfies with their new bf and I texted them: 'You're not even cute.'
My girlfriend added her ex to her Facebook and I immediately asked her to unfriend him.
I stalked my crush's new girlfriend's Facebook and left a comment: 'You're not good enough for him.'