Looks like mixi‘s becoming anonymous social network site. There’s new policies effective August 18, among many other policy changes, they are adding following to the item 16 of the prohibited actions clause.
(16) Disclosure of a contact information of third-party or a self, which can be used to identify individual, including address, phone number, E-mail address, to the part of site that is viewable by public.
Notice by this, they are prohibiting disclosure of contact information about yourself. So, when did mixi become my babysitte