There have been a number of patent filings and whitepapers from the major search engines over the past 5 or 6 years that describe how they might break a page into blocks or segments to understand things like the main topic or topics on a page, which block might be the most important for a page, what to show on smaller screens for mobile devices, and to apply different weights for links depending upon which block they are located within. By Bill Slawski
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