<quote name="Jasper Deng" date="2014-07-15" time="21:50:18 -0700">
I'd prefer that we did Google's system that, in addition to allowing a separate "sign out all other sessions" option, also allows users to monitor which IP addresses their account was accessed from (which however would be akin to self CheckUser and might run afoul of our privacy policy).
https://bugzilla.wikimedia.org/show_bug.cgi?id=27242 and https://www.mediawiki.org/wiki/Extension:AccountInfo