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I wonder if it's already possible to do this without a new button.

If a lot of people close to you in your social network react "angry" to something and you choose to share it, there's a good chance you're sharing it because it makes you angry too.

Graphs are cool

They're designing for engagement and/or revenues, not for outcome; we (hopefully) don't raise our children to be as hyper as possible as a leading metric.

People would quickly realize that if they share it under a negative category their share velocity would be hit. A better approach might just be to sentiment-detect negative emotion in Tweets and adjust share velocity accordingly.

that's cute that you're assuming they would want to do that.