It may not be hard to trace, say, Rhea Perlman back to Kevin Bacon, but what about you? If the age-old theory holds water, we should all be no more than six degrees away from cuttin' Footloose with Hollywood's bygone golden boy -- or anyone else for that matter. Well, Yahoo's determined to put any six-degree doubts to rest with its Small World Experiment, and what better way to do so than on Facebook? Participating users are given a "target person," and asked to "get a message to this person in as few steps as possible." They are then
