There was a time when Facebook’s privacy settings were much less developed and secure than they currently are, and you could visualize information about your friend networks using tools like Nexus. So for example the graph below was an illustration of my friend network back in 2008:
These clusters actually tell the story of my life history: of places I lived, schools I went to, and communities I spent time with.
Nowadays, social media platforms protect your privacy and those of your contacts’ much more closely than they used to, so generating graphs like these are much more difficult. However, if you want to give it a shot, a good place to start is Visualising My Facebook Network Clusters.