[@peterverkooijen Participant 14 years, 10 months ago]

@r-a-y (“Usernames are unique.”) Only when they are required to be unique. You could also require display/real names to be unique. The emerging standard is that the email address has to be unique. The @mentions system could check by the email address connected to the real name. There really is no excuse to keep a username at the center of all things.