Seth Godin recently wrote a post which hinges on Dunbar's Number. Seth started out by misstating what Dunbar's Number is, and then goes off the rails, predictably:

[via Dunbar's Number isn't just a number, it's the law]

Dunbar's number is 150.

And he's not compromising, no matter how much you whine about it.

Dunbar postulated that the typical human being can only have 150 friends. One hundred fifty people in the tribe. After that, we just aren't cognitively organized to handle and track new people easily. That's why, without external forces, human tribes tend to split in two after they reach this size. It's why WL Gore limits the size of their offices to 150 (when they grow, they build a whole new building).

Ok, slight problem. Dunbar's Number represents the largest stable social group, 150 people more or less, where all the members not only know each other, but understand how each member is related to the others, and the nature of their social interactions.

Clearl