In addition to what everyone else said, I like tagging instance admins too. Only my instance admins are highlighted (red), but I like to know an admin when I see one in the wild lol.

I’ll also tag accounts that show a lot of specialized knowledge in their field of work. Like, “environmental scientist” or “airline pilot” or something like that.

But most of the time there are no tags, I’m just relying on my total upvote/downvote count towards the account to get some sense of who they are.