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When viewing Google cached pages of a particular DMOZ directory (Top: Shopping : Sports), I notice that there is a wide discrepancy on the date that particular sub-directories are cached by the spider.
They range anywhere from April 21st to June 10th.
I cannot see any particular logic why some are cached more recently than others. It doesn't seem to be based on alpabetical listing, number of sites in the subdirectory, popularity of the directory (e.g Petanque vs Martial Arts)
Can anyone offer any ideas?