"this raises a number of questions: Q: though i wouldn't be surprised if it's true for most articles it can't be true for all articles. can it? Q: what's the distribution of distances (measured in "number of clicks away") from 'Philosophy'?
Q: by this same measure what's the furthest article from 'Philosophy'? Q: are there any other articles that are more common than 'Philosophy'? Q: what are the common paths to 'Philosophy'?"

"Basically: this is a graph representation of the similarity relationships derived from the database of Last.fm. The circles (vertices) on the left hand side figure are bands, musicians, composers, whatever you will find in the Music section of the site. Lines (edges) connect similar artists."

"Average SAT (with margin of error) for the 100 most popular books on facebook."

The mood levels reported by LiveJournal users plotted on a graph.