Dare I say it but providing more identity hints has really improved reddit. Thanks to some css :after trickery (and now built in support for managing that), it became possible to put more identity information next to usernames called "flair". This ranges from the football team a user supports in /r/soccer, to being a Mojang employee in /r/minecraft/, to getting an AK47 flair for being a verified successful sender of candy in /r/snackexchange. And of course reddit employees, past and present get global flair avoiding awkward "do you know who I am" incidents ;)