The Dunbar Number
Cameron Marlow, serving as a "resident sociologist" for Facebook, discovered the following data on how people left comments on friend's pages:
Task 1: Do an informal survey of "friends" and see if these statistics hold.
- The average male member left comments on seven friends' pages
- The average female member left comments on ten friends' pages
In this same regard, Robin Dunbard, an Oxford anthropologist, claims that 150 is the upper limit or size for a "cohesive social group." This is the infamous Dunbar number.
Task 2: Do an informal survey of friends in your local social area (e.g. school, community) and see if the Dunbar number holds.
Source: Wired, August 2009