This seems pretty obvious, doesn't it? Your interests are the subreddits that you're subscribed to. They don't need to do any "tracking" because that's just h

This seems pretty obvious, doesn't it? Your interests are the subreddits that you're subscribed to. They don't need to do any "tracking" because that's just how the site works by default. Steve's tone here is pretty clearly tongue-in-cheek.