Primates on Facebook - How we still communicate with only a handfull of people

An interesting piece of research by the Facebook Data Team published in Economist and further discussed in a post by the FB Data Team that finally sheds some light to the age old question of the effects of communication technology to the so called Dunbar number, the magical maximum number of 150 (148 to be exact) contacts in the social network that human brain is hardwired to handle. In addition, and more interestingly, the study found out that we tend to have the same old small circles circles for intimate relationships that we had before the era of social networking services, or any other preceding technologies:
“In Facebook, an average man—one with 120 friends—generally responds to the postings of only seven of those friends by leaving comments on the posting individual’s photos, status messages or “wall”. An average woman is slightly more sociable, responding to ten. When it comes to two-way communication such as e-mails or chats, the average man interacts with only four people and the average woman with six. Among those Facebook users with 500 friends, these numbers are somewhat higher, but not hugely so. Men leave comments for 17 friends, women for 26. Men communicate with ten, women with 16.
What mainly goes up [with the help of technology], therefore, is not the core network but the number of casual contacts that people track more passively. This corroborates Dr Marsden’s ideas about core networks, since even those Facebook users with the most friends communicate only with a relatively small number of them.
Technologies like News Feed and RSS readers allow people to consume content from their friends and stay in touch with the content that is being shared. This consumption is still a form of relationship management as it feeds back into other forms of communication in the future. Still, people who are members of online social networks are not so much “networking” as they are “broadcasting their lives to an outer tier of acquaintances who aren’t necessarily inside the Dunbar circle,” says Lee Rainie, the director of the Pew Internet & American Life Project, a polling organisation. Humans may be advertising themselves more efficiently. But they still have the same small circles of intimacy as ever.”
The graph below shows the same data as the first graph, only combined for both genders. What it shows is that, as a function of the people a Facebook user actively communicate with, you are passively engaging with between 2 and 2.5 times more people in their network.

What effect does a 2x increase in connectivity mean for a network? The easiest way to observe this is to look at one person’s personal network:

“The first diagram shows an entire network, namely all of the friends, and all of the relationships between the friends. It is clear that the cluster on the top is the highly connected set of coworkers, and the cluster on the right is another group of friends.
The second cell shows only those relationships that have reciprocal communication. Many of the individuals in the network are completely disconnected or out of touch with each other. Moving to the third cell, we see the slightly more connected network containing one-way communication. This includes every person who wrote a comment, sent a message or wrote a wall post to one of my coworker’s other friends. The final cell shows the passive network, including all those people who were keeping up with their friends. While some of the friends are still disconnected, a very large percentage are now reachable through some set of observations.
The stark contrast between reciprocal and passive networks shows the effect of technologies such as News Feed. If these people were required to talk on the phone to each other, we might see something like the reciprocal network, where everyone is connected to a small number of individuals. Moving to an environment where everyone is passively engaged with each other, some event, such as a new baby or engagement can propagate very quickly through this highly connected network.”