Six degrees of separation is the hypothesis that anyone on Earth can be connected to any other person on the planet through a chain of acquaintances with no more than five intermediaries.

this may be tested by using a online Social Network like Facebook to see who actuall know's who, and who are friends with people. This would have to either be done by themselves, or a independent website that uses Generous users to give them there log-in information to see if theres connections between everyone else on the site.

A site like myspace wont work as well because connections will be like: "you know jim, who know's sara from work, who met sam on myspace" the myspace connection is not a strong one, so it would be better if there "friends" are real life "friends".