A communication management server computer (“server”) and related methods are disclosed to create and store digital records representing alliances between user accounts and to use the alliance records in filtering messages or other content and/or determining attributes of messages or content for display. The server allows two electronic devices associated with two user accounts to establish an alliance, where each of the two user accounts offers a set of digital communications for exploration of relationships and agrees to share certain types of information regarding the relationships with the other user account.