That's rather obvious. Due to Dunbar's number (the rough maximum number of human relationships you can maintain), reputation is a very scarce resource. To the

That's rather obvious. Due to Dunbar's number (the rough maximum number of human relationships you can maintain), reputation is a very scarce resource. To the extent that corporations and brands are virtual individuals, I think this explains why so many Internet markets are winner take all. There is only one Facebook because Facebook occupies a "Dunbar slot" in the minds of its users and those slots are scarce. Also means that more B2B or behind the scenes Internet companies may not be as winner-take-all as B2C Internet fronts and gateways. To an extent the 'portal' hype from the original dot.com boom was correct-- portals are super-valuable and tend to be winner-take-all or at least a few winners take most.