Prevent multiple instances of the same user handle
Prevent multiple instances of the same user handle.
Several users are signing on to our forum using their first name as their Username. In addition they're not using avatars. The result is that they can't be accurately tagged (mentioned) in a comment.
For example, we have several users with the username "Mark" with no avatar. Trying to tag one results in a string of "Mark" options with no way to discern which is which.