Facebook Page for Squashy Frog PhotographyAt the end of last week, the Economist ran a story entitled, “Primates on Facebook,” about the capability of humans to maintain social networks via websites such as facebook. The answer it seems, is that we are quite limited…

The Economist reports:

That Facebook, Twitter and other online social networks will increase the size of human social groups is an obvious hypothesis, given that they reduce a lot of the friction and cost involved in keeping in touch with other people. Once you join and gather your “friends” online, you can share in their lives as recorded by photographs, “status updates” and other tidbits, and, with your permission, they can share in yours. Additional friends are free, so why not say the more the merrier?

But perhaps additional friends are not free. Primatologists call at least some of the things that happen on social networks “grooming”. In the wild, grooming is time-consuming and here computerisation certainly helps. But keeping track of who to groom—and why—demands quite a bit of mental computation. You need to remember who is allied with, hostile to, or lusts after whom, and act accordingly. Several years ago, therefore, Robin Dunbar, an anthropologist who now works at Oxford University, concluded that the cognitive power of the brain limits the size of the social network that an individual of any given species can develop. Extrapolating from the brain sizes and social networks of apes, Dr Dunbar suggested that the size of the human brain allows stable networks of about 148. Rounded to 150, this has become famous as “the Dunbar number”.

But the Economist wouldn’t write a story like this without calling in the sociologists…

…Moreover, sociologists also distinguish between a person’s wider network, as described by the Dunbar number or something similar, and his social “core”. Peter Marsden, of Harvard University, found that Americans, even if they socialise a lot, tend to have only a handful of individuals with whom they “can discuss important matters”. A subsequent study found, to widespread concern, that this number is on a downward trend.

The rise of online social networks, with their troves of data, might shed some light on these matters. So The Economist asked Cameron Marlow, the “in-house sociologist” at Facebook, to crunch some numbers. Dr Marlow found that the average number of “friends” in a Facebook network is 120, consistent with Dr Dunbar’s hypothesis, and that women tend to have somewhat more than men. But the range is large, and some people have networks numbering more than 500, so the hypothesis cannot yet be regarded as proven.

I’m left wanting to know more about this supposed ‘in-house sociologist’ Facebook is keeping on call…

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