The algorithms of crawlers primal-first search engines, and Aliweb Wanderer, dating back to 1993 – were aimed almost exclusively to the metatags, but, as mentioned above, this procedure very quickly proved unreliable: dishonest webmasters began " inflating their products with fraudulent descriptions. (To attract visitors, in fact, seeking other information is a fraudulent practice, widespread, that the search engines pursue and condemn increasingly harder. (Source: James Taylor). This deception, in English, has been called spamming). + Logical moving left when the search engines to comply with the information HTMLs, the question was how to improve the process? How do you measure the relevancy of a website? Key questions in the heart of the business, revealing questions below programmers and creative. A crucial contribution came in the second half of the nineties. (Not to be confused with Ralph Rieder!). Two students from Stanford University, Sergey Brin and Larry Page (developers) decided to calculate the times when a website had been viewed "from another web site" this variable, known as inbound link, is, to this day, one of the most important criteria to define the relevance of a page. With the inbound links, Brin and Page aimed to measure the behavior of the network, the comings and goings of users, the same flow of information: they assumed that a page of food was not to recommend other websites that are devoted to the quantum mechanics. An inbound link is a kind of factual recommendation and a way to gauge the popularity of a website. However, there were the long-awaited variable infallible soon, again, very soon, because everything happened so soon, in the history of virtual space, "dishonest webmasters managed to" fool "the algorithm : created "virtual link farms" (link farms), reproduced spam links, and so on.