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By now most of us are familiar with Google’s PageRank algorithm, or at least the principle behind it, whereby a web page is ranked based on who else is linking to it. One key aspect of blogs is that, while a few cover just about everything under the sun, most blogs have specific areas of focus, be it art, news, politics or what have you. Such information is potentially valuable in the context of search because a blog can announce its areas of focus — keywords, in effect — that can be taken into account by search engines, which would then know what topics a specific site tends to cover.