<p>I will add a <a href="https://stats.meta.stackexchange.com/tags/data-explorer/info">SEDE</a> query <a href="https://data.stackexchange.com/stats/query/25355/have-we-met?MyId=805&amp;TheirId=58675" rel="nofollow noreferrer">Have we met?</a> - you can replaced the userids, I've put there two users as examples. This query was mentioned, for example, here:</p>
<ul>
<li><a href="https://meta.stackexchange.com/q/179427#179439">How deep can the dive into user's interaction data be?</a> (Meta Stack Exchange)</li>
<li><a href="https://meta.stackoverflow.com/q/382991#382992">How can I search for interactions between users?</a> (Meta Stack Overflow)</li>
<li>In <a href="https://stackexchange.com/search?q=url%3A%22*query/25355*%22">several other discussions</a></li>
</ul>
