Seven degrees to Kevin Bacon is a being lazy.
Facebook says it's less than 5 hops for the whole world.
Facebook
Quote:
The idea of ‘six degrees of separation’ -- that any two people are
on average separated by no more than six intermediate connections
-- was first proposed in 1929 in a short story by Hungarian author Frigyes Karinthy,
and made popular by the John Guare play and movie, Six Degrees of Separation.
"Using state-of-the-art algorithms developed at the
Laboratory for Web Algorithmics of the Università degli Studi di Milano,
we were able to approximate the number of hops between all pairs of individuals on Facebook.
We found that six degrees actually overstates the number of links between typical pairs of users:
While 99.6% of all pairs of users are connected by paths with 5 degrees (6 hops),
92% are connected by only four degrees (5 hops).
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Of course, the 5,316 members of THE CELLAR, made it much shorter. 
.