I don&#x27;t have a source, but no, I remember hearing about them before Slack&#x27;s reactions were released. What they really were is a take on (&quot;copy of&quot;) Path&#x27;s reactions[1], which are very similar in concept.<p>But I think putting too much importance on &quot;copy&quot; is wrongheaded. Facebook&#x27;s team seems smart to &quot;copy&quot; these things from other platforms that prove their worth, just like tons of other platforms &quot;copy&quot; original things that Facebook&#x27;s team has vetted. Who cares.<p>[1]: <a href="http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;10&#x2F;08&#x2F;with-reactions-facebook-supercharges-the-like-button-with-6-empathetic-emoji&#x2F;" rel="nofollow">http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;10&#x2F;08&#x2F;with-reactions-facebook-sup...</a>