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 I think there are ambiguities.  

I don't think so.  Facebook is formal: if both users confirm the connexion then they are friends.

More seriously, I remember some paper about blogs, speaking in terms of mutual awareness.  Anyway your question is far too underspecified.  What are you interested in?

Christophe. 
(depuis mon téléphone)

Le 24 oct. 2012 à 17:59, hamid zargari <[log in to unmask]> a écrit :

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Dear all,
I am confused about friendship definition in social graphs. Does having mutual edges ( may be with higher weight) imply to human friendship? I think there are ambiguities.  
 
Bests 
 
Hamid Zargari Asl
University “Mediterranea” of Reggio Calabria
E-mail: [log in to unmask]
 
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