You're right, the heart emoji was integral to the attack. If I recall correctly, a new escaping mechanism for how emoji were handled was deployed and caused the XSS vulnerability.
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The heart is the most important part of this. The XSS attack wouldn't work without it. I think it had to do with the way TweetDeck escaped HTML.
literally a heart attack
You're right, the heart emoji was integral to the attack. If I recall correctly, a new escaping mechanism for how emoji were handled was deployed and caused the XSS vulnerability.