The line between a friend and an enemy is sometimes as fine as the one between bravery and stupidity. This little friendscouting-model shows who to trust.
So, let’s start in the bottom-left corner: „The Enemy of my Enemy is my Friend“. We all know this basic principle from the school yard. Some senior citizens might be remembered of World War II when longtime enemies France and Britain united against Nazi-Germany. Let’s have a look at the upper-left square: „The Enemy of my Friend is my Enemy“. This is the highly moralistic conversion of the Machiavelli principle. Some of you might have been lucky enough to have experienced this in the school yard. Others might know it from math: trusting other and being trusted (tit for tat) is the ultimative solution for the prisoner’s dilemma in game theory. „The Friend of my Enemy is an A…hole“ – everyone who’s ever experienced betrayal knows what we’re talking about. And finally: „The Friend of my Friend is my Friend“. This is the basic principle of Facebook. Here’s a question: How many friends do you have on Facebook? How many of them do you know? And how many do you trust?