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8.3. The Mysterious PageRank
You might hear a lot of people talk about Google's
PageRank, bragging
about attaining the misty heights of rank 7 or 8 or speaking
reverently of sites that have achieved 9 or 10. PageRanks range from
(sites that have been penalized or not ranked) to 10 (reserved for
only the most popular sites, such as Yahoo! and Google itself). The
only place where you can actually see the PageRank of a given URL is
the Google Toolbar [Hack #60] ,
though you can get some idea of popularity from the Google Directory.
Listings in the Google Directory contain a green bar next to them,
providing a good idea of a listing's popularity
without giving an exact number.Google has never provided the entire formula for their PageRank, so
all you will find in this book is conjecture. It
wouldn't surprise me to learn that the formula is
changing all the time; as millions of people try myriad methods to
increase their page ranking, Google has to take these efforts into
account and (sometimes) react against them.Why is PageRank so important? Because Google uses that as one aspect
of determining how a given URL will rank among millions of possible
search results. But that's only one aspect. The
other aspects are determined via Google's ranking
algorithm.
