You may have heard of ASmallWorld, the social network where, rumor has it, the super-rich plan their baby-eating, wife-swapping debauchery and hunts for endangered species. Or something like that. My coworker Megan McCarthy has an account, so it can't be all that exclusive. It turns out there are more social networks for the elites and for the second time in four months, BusinessWeek has profiled them.