It&#x27;s pretty cool to see these appear on Facebook.  Since Slack integrated them a few months ago, my team has found it convenient for aggregating reactions in a better way than sending everyone a notification for &quot;cool&quot;, &quot;lawl&quot;, &quot;props&quot;, etc.<p>Zuckerberg&#x27;s post feels like the most authoritative source.<p>Dupes:<p><pre><code>  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10351954
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10353942
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10352192
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10353715
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10354110
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10354216
  https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10353447</code></pre>