Prime examples are Google's personalized search results and Facebook 's personalized news stream. In this case the page may differ from the search terms indexed.
Some sites are crawled exhaustively, while others are crawled only partially". Other scholars do not share Pariser's view, finding the evidence in support of his thesis unconvincing.
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Some sites are crawled exhaustively, while others are crawled only partially". If a visit is overdue, the search engine can just act as a web proxy instead. Pariser related an example in which one user searched Google for "BP" and got investment news about British Petroleum while another searcher got information about the Deepwater Horizon oil spill and that the two search results pages were "strikingly different".
Most Web search engines are commercial ventures supported by advertising revenue and thus some of them allow advertisers to have their listings ranked higher in search results for a fee. There are two remaining reasons to submit a web site or web page to a search engine:
Boolean operators are for literal searches that allow the user to refine and extend the terms of the search.
As well, natural language queries allow the user to type a question in the same form one would ask it to a human.
Beyond simple keyword lookups, search engines offer their own GUI- or command-driven operators and search parameters to refine the search results. Search engines that do not accept money for their search results make money by running search related ads alongside the regular search engine results. Searching  Web search engines get their information by web crawling from site to site.