Mark Zuckerberg’s popular social network is based on friendship relationships, that is, two people are united if they are friends on Facebook. In this way, one can see what the other publishes, mention themselves in posts or comments, see their profile photos and image albums, etc. Surely on more than one occasion some of our friends on Facebook have also wanted to be friends with other friends of ours within the social network, but we have not found an easy way to recommend one of…

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