Steps to reproduce:
- Log in as Admin
- Enable Message Stream (Administer Wiki > Other > Message Stream > Yes > Save)
- Create a new user (Administer Wiki > Users & Rights > Create user)
- Click on the username to go to the profile of the newly created user (or search for username)
- Observe the users listed in the Send Message section
Expected results: The users present in the wiki are listed.
Actual results: The user that is accessed appears with his username and also as ""xwiki:XWiki.user01"