Silly rant... It would be more useful to explore why a service/site would like to 'hide' user names... and how it should be done. If a site/service needs to hi

Silly rant... It would be more useful to explore why a service/site would like to 'hide' user names... and how it should be done. If a site/service needs to hide user names then it needs to do a better job with signups. It's possible to hide user names / emails during signups too and say: "if you already have an account you'll get a reset password link otherwise welcome message from us".