Most I laughed all morning. I thought you were talking about one of these: 💖 That's funny!!
Ok, yes, those hearts are the people who have voted the content. To the left of those hearts is the upvote button, that heart is everyone who clicked the upvote button.
Thank you! And... I could never see my upvote count. But now I've figured out I have to hit the blue up arrow for it to happen. I love the blockchain (purchased first crypto in '15 but not much and I missed a lot in the interim). I've been down the rabbit hole for the last three months, but these UXs are kinda clunky IMO.