This is a really neat article that claims the average degree of seperation on the web is 19 clicks. If you buy the 6 degrees theory, this is very similar.
Thus was born the \"19 clicks of separation\" theory of
the Web. This scientific effort to size the Web has
helped reveal the organic way in which the global
network is growing.
Like the celebrated \"six degrees of separation\" that
supposedly can connect any two people on the planet,
researchers at the University of Notre Dame recently
estimated that any two randomly selected sites on the
Web are connected, on average, by 19 clicks.
The Notre Dame team says, on average, you can get
from one site on the Web to any other randomly
selected site in about 19 clicks.