<p>One of the guiding principles for 'what site should I migrate this question to' is, 'keep it where it is, unless it'll get much more love somewhere else.' This very question was brought up many times back when the whole <a href="http://area51.stackexchange.com/">Area51</a> thing started out. In brief, The Powers That Be are not afraid of overlap. In fact, overlap can be good. Overlap builds (multiple) communities. </p> <p>Specifically regarding the AskUbuntu and Unix/Linux point: <a href="http://meta.stackexchange.com/a/72753/131633">http://meta.stackexchange.com/a/72753/131633</a></p> <p>Where things get tricky, especially for a site like ours that has been here long enough we now have questions that are over 2 years old, is the shifting values of 'topical'. Thanks to the Ubuntu, and especially the Unix & Linux stackexchanges, we are no longer the default site for "how do I do complex things on a [generic] Linux system" questions. It has allowed us to focus more tightly on the first line of our FAQ:</p> <blockquote> <p>Server Fault is for system administrators and desktop support professionals, people who manage or maintain computers in a professional capacity.</p> </blockquote> <p>We are now giving the benefit of the doubt to ever fewer questions here. Unless it's clear that something is in a professional capacity, we're much more likely to shovel it on over to SuperUser or just OT-close it. </p> <p>That said, we do have Pro-Sysadmins who are up to their eyeballs in <a href="http://sharepoint.stackexchange.com/">Sharepoint</a> or <a href="http://wordpress.stackexchange.com/">Wordpress</a>. Their questions, if asked on SF, shouldn't be immediately OT-migrated to their respective SE sites unless we simply can't handle them. They <em>are</em> topical here. The same goes for Mongo, MySQL, and MSSQL. The key thing is "professional capacity". </p> <p>As for Keeping Track of All The Things, one of the coping mechanisms they created was the ability to follow tag-sets on multiple sites.</p> <p><a href="http://blog.stackoverflow.com/2011/04/improved-tag-sets/">http://blog.stackoverflow.com/2011/04/improved-tag-sets/</a></p> <p>This would allow you to follow <a href="http://serverfault.com/questions/tagged/mongodb" class="post-tag" title="show questions tagged 'mongodb'" rel="tag">mongodb</a>on SF, DBA, and even SO and SU. </p>