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http://www.zdnet.fr/actualites/facebo...x-y-est-actif-39824148.htm#xtor=RSS-1
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http://www.huffingtonpost.com/lauren-...06876.html?ncid=fcbklnkushpmg00000063
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http://www.newyorker.com/science/mari...affect-math-dunbar-number-friendships
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