  Is visitors' attendance a fair indicator of a web site's quality? Internet
sub-domains are usually characterized by power law distributions of visits,
thus suggesting a richer-get-richer process. If this is the case, the number of
visits is not a relevant measure of quality. If, on the other hand, there are
active players, i.e. visitors who can tell the value of the information
available, better sites start getting richer after a crossover time.
