Search Engines Algorithm
Despite the huge sums invested in search engines, and their ubiquitous in front of Internet users, their algorithm is still something primitive which is based on keywords and various signals. Some are considering moving to a semantic search, ie a better understanding of the content of sites to associate it to queries in context. Could this work? To what extent can we understand what the user wants without a deep intrusion into his private life?
This study of search engines and SEO reports the current knowledge of algorithms and the effect on the ranking in search results pages. Google, Bing, Yandex, Yahoo, DuckDuckGo have common rules and peculiarities.
This knowledge of the algorithms is essential for the visibility of a site. Google evaluates them on the basis of statistics. If a site, perfectly interesting and useful, can be described by criteria generally attributed to spam sites, it will be penalized.
Ranking according to a Google patent
From a patent from Google about techniques for calculating search results, it showsand why a website goes to sandbox. Google attribute to each page a score to rank in the list of results that are relevant to a search. The PageRank is only a part of scores of pages.
- Criteria of ranking
Based on the safest sources, it is necessary to clarify some points on how the results are determined by search engines for avoiding misconceptions.
- Positive and negative signals for the algorithm
Each aspect of the site, including the design, contribute to its ranking. Criteria are called "signals" by Google. List of signals and their effects.
- What we should know about PageRank
The older criterion.
- PageRank and nofollow
What is the real effect of the nofollow attribute?
- Bounce factor.
Does it influence results of search engine? How to lower the bounce factor?
To evaluate the freshness of documents.
A secret of Google's algorithm being revealed.
Patent about ranking based on backlinks
Patent about user behavior and how they use backlinks.
The first ranking factor in details.
- What is a black hole site?
To not add links to other sites.
Panda patent made simple
Simplified description, comparison with the real experience.
- Understanding Panda
A new major criterion for ranking, how to update its site.
- Panda, facts and myths.
Misconceptions about the algo.
It is an alternative from Microsoft to the PageRank.
Evolution of Google's algorithm since the origin
- Evolution of Google's SERPs and interface
- Changes in the page of results.
Google works on its algorithm
Based in part on a NYT article by a reporter who visited the laboratory.
Avoid black hat techniques (Alexa graph)
Google has made several tip sheets to the attention of webmasters, and held roundtables to inform them. All this information is listed below. Since the algorithm becomes more and more aggressive towards spams and uses approximate signals to identify them, we must know the way to cross this minefield.
from Google to webmasters
Lot of questions from webmasters, the team at Google Webmaster Central answered all of them.
Google SEO Report Card, a summary
Stats about optimizations on websites.
SEO for Bing
Advices to webmaster by the search engine.
- How to find information on the Web.
Search engines are not the only mean to find answers on Internet.
- Search engines
List and basic technologies.
- Free online
It is a form in Ajax for checking the optimizon of your site for search engines. If your score is too low, you'll find here the infos to improve your site.
- How to know
the traffic of a website.
With the statistics panel provided by Alexa.
- List of tools for webmasters.
- List of digg-like and bookmark sites.