For some webmasters Google crawls too often (and consumes too much bandwidth). For others it visits too infrequently. Some complain that it doesn't visit their entire site and others get upset when areas that they didn't want accessible via search engines appear in the Google index. When done properly, taking …

Prominence implies that a word used at the beginning of a link or piece of text is more important than the rest. The words that follow are scored lower and lower by the algorithm until (in a very long text section) their value tends toward zero or is cut off …