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The fake version of yourself you show on Facebook, like a lying, loudmouth version of you that's totally different from the real you.
My Facebook self is a gym bro who eats salad for breakfast. My real self is a couch potato who eats pizza at 3 am.
She posts selfies with her 5 best friends every day. In real life, she can't even remember her own dog's name.
He's always posting about how he's rich and successful. In real life, he's broke and gets kicked out of his mom's house.