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During the port, we discovered that there is no way to see the relationships of other users except when you use the blocks or custom views.
We should think how we should properly deal with that in the future. Not yet sure if this is 7.x-1.x or 7.x-2.x. Maybe some improvements to 7.x-1.x but the cool stuff needs to wait.
A simple thing would be a new view other relationships permission, that allows to give read-only access to relationships of other users in a controlled way.
One cool thing would be a field access module which would give users for example control over which fields on their user account are visible to whom (All/Friends/...).