Topics (aka tags): you click on a user-name and see that sadly :-( you have no topics in common, you then...
Add them anyway cause they said something really cool.
Add their topics and now have something in common.
Don’t add their topics cause they (the topics) are of no interest to you/or vice versa.
Don’t really pay attention to tags and just get questions based on your activity.
None/All of the above plus explanation…