There are certain conditions to be met. A - Friends Hidden. B - Friends Hidden. A and B are Friends. C - Not friends with A and B. if C views mutual between A

There are certain conditions to be met. A - Friends Hidden. B - Friends Hidden. A and B are Friends. C - Not friends with A and B. if C views mutual between A and B, C sees only the list of mutual friends between A and B whose friends lists are open. i.e. if the list shows D and E. D - Friends should be viewable to everyone. E - Friends should be viewable to everyone.