Board Thread:Support Requests - Designing Your Wiki/@comment-4591506-20131101050535/@comment-1158325-20131101062638

There's no way to do it automatically. You'd have to make a template or subpage of your userpage that you update all the time. I've also seen people use the user masthead "I am" field for this, which has the advantage of not showing changes. But both of these methods eventually get forgotten about, in my experience.

You could make a script that checks if the user has edited in the last however many minutes, if that would be accurate enough for your purposes.