It&#x27;s discoverable in the sense that if you do the right thing, you discover it. It&#x27;s undiscoverable in the sense that, even now with long-tap being a fairly common &quot;right click&quot; on touch devices, there&#x27;s no indication (unless I&#x27;ve missed one) that a long tap does anything here until you try it by accident. It&#x27;s not a question of &quot;that&#x27;s hard to do&quot;, but of &quot;why would you even do that?&quot; A horizontal pinch-zoom or horizontal drag would be arguably more intuitive as a way to expand the like button.