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People think about PageRank in lots of different ways. People have compared PageRank to a “random surfer” model in which PageRank is the probability that a random surfer clicking on links lands on a page. Other people think of the web as an link matrix in which the value at position (i,j) indicates the presence of links from page i to page j. In that case, PageRank corresponds to the principal eigenvector of that normalized link matrix . Disclaimer: Even when I joined the company in 2000, Google was doing more sophisticated link computation than you would observe from the classic PageRank papers. If you believe that Google stopped innovating in link analysis, that’s a flawed assumption.
As SEOs, we are interested in the most influential factors in commercial web search results. Accordingly, we have been conducting ongoing studies looking at the relationship between web search results and link metrics/anchor text from Linkscape, social media signals from Facebook and Twitter, and on-page/URL/domain keyword factors. This document explains our methods, including the construction of the data set and statistical analysis. It is structured as follows: the following section includes some details on the dataset itself, from the choice of the keyword list to data sources and feature extraction.The last section describes our statistical analysis methods. Before diving into the details, we want to mention several important things about the analysis.
Death to Content Farms: Google Tweaks Algorithm to Find More "High-Quality Sites" Google today made a major change to its search algorithm that will affect almost 12% of all queries. According to a blog post written by the company’s Amit Singhal and Matt Cutts, this change is meant to highlight high-quality sites and push down “sites which are low-value add for users, copy content from other websites or sites that are just not very useful.” While Google doesn’t mention content farms by name, there can be little doubt that this update is directly aimed at them and scraper sites that just copy content. According to Google, this update doesn’t take any data from the Personal Blocklist Chrome extension into account, yet.
Par Olivier Duffez , Mercredi 29 juillet 2009 Depuis le lancement de Bing le 1er Juin 2009, vous cherchez peut-être à améliorer le référencement de votre site sur Bing Search, le nouveau moteur de recherche de Microsoft. Pour compléter les premiers conseils aux webmasters pour Bing , voici un premier guide du référencement sur Bing .
Last week, while in London, I received an email from Paul Graham , whom I've long admired, possibly even idolized a bit. He asked if I was available to come speak at a YCombinator SEO event in Mountain View. Tonight, I presented at that evented and thought I'd share my experiences, recommendations and yes, my presentation. Not everything that was discussed is public, in fact, much of it is "classified" at YC's request. However, there's so much good material that it would be criminal not to share. First up, my presentation from the YCombinator SEO for Startups event (naturally, hosted on YC company and prior SEOmoz consulting client, Scribd ):