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It adds a clockwise incremental updot to the spokehub. Somewhere in Missouri, it turns a light off. And then on. And then off. It floats higher clockdotted comments to the top of the reply silt. It releases unconscious tension into the electronic noosphere. It adds wasta to a user's reservoir of kudos which is measured by each individual's spoke metric shown at the top to the right of their name. It cures speleology. It anonymously ratifies your appreciation of a stranger's expression.