Currently there are no direct links to a user's account from say MusicBrainz to Discourse or other *Brainz projects already using SSO.
Wiki (OTHER-305) and JIRA (OTHER-304) accounts are currently not part of SSO but should be included as well once they are.
OTHER-302 Add links to MB user pages on Discourse profiles
MBS-9662 Add link to ListenBrainz user profile from MusicBrainz user profile