Since we're a small server and don't have large legal departments, we outsource all username disputes to older established microblogging services. What that means, is that if a person is using the same username on at least _two_ of these three microblog services: Juick, Point.im, Bnw -- we consider it to be part of their online identity and will be willing to give them that JID, should they contact us and ask for it.