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4.1 Google’s Changes CHAPTER IV USES IN WEB SEARCHES Google has launched many updates over the years in a constant attempt to combat spam and make sure that their search results show the most relevant sites (Wall, 2009-2017). On December 1, 2000, Google introduced the PageR- ank Toolbar, an update that added several search features to a toolbar on the browser. One important part of the update was the addition of a display of the PageRank of the site, which brought the PageRank number into the public eye. Google has done many minor updates over the years that were not doc- umented for the public, but major ones have been. After a series of uncon- firmed updates, Google put out the Florida update, which drastically changed the PageRanks of many webpages, mostly cracking down on some deceptive tactics to adjust PageRank. After that came the Brandy update, with a massive index expansion, synonym expansion, and increased attention to anchor text. The next major update was actually a collective effort with Google, Yahoo!, and Microsoft introducing the nofollow attribute, which could be added to links in webpages to show they were not approved by the page and not to be counted in the PageRanking. This helped deal with spamming of links in comments and forums. In June of 2005, Google introduced the Personalized Search, which integrated a user’s search history into their search results. Over the next few years, Google put out updates Jagger, Big Daddy, Vince, and Mayday, with mostly minor changes. Caffeine, an update in June of 2010, introduced major changes and integration of crawling and indexing, resulting in a fresher index. Several more updates rolled out until February 2010 with 17PDF Image | MATHEMATICS BEHIND GOOGLE PAGERANK ALGORITHM
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