2009年最新搜索引擎排名因素

　　美国搜索引擎营销公司seomoz8月底公布了2009年搜索引擎排名因素，该结果以72位业内SEO(搜索引擎优化)专家提供的数据为基础，两年公布一次。

　　排名五大因素：

　　1.外部链接锚文本

　　2.Title标签关键字的使用

　　3.原始链接流行度

　　4.链接域名的多样性

　　5.根域名关键字的使用

　　排名的五大消极因素：

　　1.恶意伪装

　　2.从链接中介购买链接

　　3.基于User Agent的伪装

　　4.频繁的服务器宕机

　　5.群发垃圾链接

　　英文原文：http://www.91kd.cn/wangshangzixun/4173.html

　　Top 5 Ranking Factors

　　Keyword Focused Anchor Text from External Links

　　73% very high importance

　　73%

　　External Link Popularity (quantity/quality of external links)

　　71% very high importance

　　71%

　　Diversity of Link Sources (links from many unique root domains)

　　67% very high importance

　　67%

　　Keyword Use Anywhere in the Title Tag

　　66% very high importance

　　66%

　　Trustworthiness of the Domain Based on Link Distance from Trusted Domains (e.g. TrustRank, Domain mozTrust, etc.)

　　66% very high importance

　　66%

　　See all ranking factors

　　-

　　Top 5 Negative Ranking Factors

　　Cloaking with Malicious/Manipulative Intent

　　68% very high importance

　　68%

　　Link Acquisition from Known Link Brokers/Sellers

　　56% high importance

　　56%

　　Links from the Page to Web Spam Sites/Pages

　　51% moderate importance

　　51%

　　Cloaking by User Agent

　　51% moderate importance

　　51%

　　Frequent Server Downtime & Site Inaccessibility

　　51% moderate importance

　　51%

　　See all negative ranking factors

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　　Top 5 Most Contentious Factors

　　Cloaking by Cookie Detection 16.3% strong contention

　　Cloaking by JavaScript/Rich Media Support Detection 15.4% moderate contention

　　Hiding Text with same/similar colored text/background 15.3% moderate contention

　　Cloaking by IP Address 15.3% moderate contention

　　Cloaking by User Agent 15.2% moderate contention

　　Note: Consensus and contention percentages are calculated based on the standard deviations of contributor answers.

　　Participants were asked to apply the ranking factors to Google’s search engine, and although we’ve found that it’s largely applicable to other major US engines (Bing, Yahoo! & Ask), some variance almost certainly exists.

　　Overall Ranking Algorithm

　　24% Trust/Authority of the Host Domain

　　22% Link Popularity of the Specific Page

　　20% Anchor Text of External Links

　　15% On-Page Keyword Usage

　　7% Traffic and Click-Through Data

　　6% Social Graph Metrics

　　5% Registration and Hosting Data

　　See more detailed SEO opinions

　　--------------------------------------------------------------------------------

　　About The Survey

　　Every two years, SEOmoz surveys top SEO experts in the field worldwide on their opinions of the algorithmic elements that comprise search engine rankings. This year features contributors from the US, UK, Canada, Australia, New Zealand, Iceland, the Ukraine, the Dominican Republic and many more.

　　Each participant was asked to rate more than 100 search ranking factors along with specific questions about hot issues in the SEO field. This document, representing the collective wisdom of expert practitioners, is, in opinion, one of the most useful resources for SEO practitioners of all varieties, helping to provide transparency into what matters (and doesn’t) for best practices in search engine optimization.

　　Enjoy! And feel free to provide feedback via this blog post.

　　Rand Fishkin,

　　SEOmoz Co-Founder & CEO

　　Special thanks to: Sam Niccolls & Timmy Christensen of SEOmoz without whom this document wouldn’t exist and to David Mihm, whose companion spin-off, Local Search Ranking Factors, features excellent data in a similar format on Google’s Local/Maps rankings.

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