Since LL changed user names for new accounts after 2010 to a single name with a last name of Resident, and also allowed display names, I have seen a lot of confusion in-world. To simplify this mess, why not have both user names AND display names viewed by everyone by default, without an option to not view one or the other. I think that would make everything consistent and easier to identify other avatars. As it is now, those who choose not to view display names end up calling other avatars by their user name, which may not be the preferred name they wish to go by.