What about confusion? 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Honestly that emoji looks like "disappointed" or "horrified" to me
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Yeah twitter emoji suck
End of conversation
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unfortunately, most people aren't interested in using social media this way
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They’ll be interested in whatever the UX tells them to be interested in

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Call it Delight
Thanks. Twitter will use this to make your timeline better. UndoUndo
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if it isn’t there already, and make it the default over ‘like’ or ‘heart’ and use it as primary boosting cue