BoingBoing reader Eli the Bearded says:
In this era of renewed interest in social networks, finally comes the results of perhaps the biggest social network connection study. Snip: "We report on a global social-search experiment in which more than 60,000 e-mail users attempted to reach one of 18 target persons in 13 countries by forwarding messages to acquaintances. We find that successful social search is conducted primarily through intermediate to weak strength ties, does not require highly connected 'hubs' to succeed, and, in contrast to unsuccessful social search, disproportionately relies on professional relationships."