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Eyes, brows, and a mouth are not enough for these smiles! To express an emotion, they add hands. Honestly, it seems to be too easy. Other emojis squint their yellow faces and push in an effort to show you what exactly they want to convey. These pull out hands — and everything gets clear right away.
By the way, if you've been looking for a classic facepalm, congrats, you've found it: 🤦.