如果你’我曾经听说过“TrustRank” before, it’无论是谁撰写或提及的内容，都可能在讨论Yahoo / Stanford的论文，标题为 Combating Web Spam with 信任等级 （pdf）。 While that 信任等级 paper was the joint work of researchers from Stanford University and Yahoo, many writers have referred to it as 谷歌 信任等级 since its publication date in 2004.
While Yahoo has a 信任等级 approach, 谷歌 does not have a similar approach. Yahoo 信任等级 is aimed at identifying Spam on the Web. It has been patented, under the name 基于链接的垃圾邮件检测。 Because that Yahoo patent exists, 谷歌 could not be granted a patent that covers the same processes – the USPTO would not grant such a patent. However, there is a 谷歌 信任等级.
的confusion over who came up with the idea of 信任等级 wasn’t helped 通过 谷歌 trademarking the term “TrustRank” in 2005. That trademark was abandoned 通过 谷歌 on February 29, 2008, according to the records at the USPTO Tess database:
But it appears that 谷歌 has come up with a system for reordering the rankings of web pages based upon a 谷歌 信任等级. This is not similar to Yahoo’的方法，因为它不是像Yahoo 信任等级那样针对垃圾邮件的方法。
Does a 谷歌 信任等级 exist?
谷歌 did not copy Yahoo’s 信任等级, because Yahoo patented the idea, and could exclude 谷歌 for using their 信任等级 process. It’s worth reading through both patents to understand how different they are from each other. 谷歌 信任等级 has to do with changing the rankings of search results, instead of finding Webspam like Yahoo 信任等级.
A patent granted to 谷歌 last week discusses how a 信任等级 might be associated with people who apply labels to web pages through annotations while setting up a custom search engine. 的idea of using annotations is kind of interesting considering 谷歌’s recent release of 边栏评注 – but there’s no sign from 谷歌 that 边栏评注 and the user 相信 system in this patent are related.
Some of the ideas in 谷歌’发明人Ramanathan Guha的专利与他在IBM期间合着的论文有些相似– Propagation of 相信 and distrust （pdf）。
的Google 信任等级 patent itself is:
Search result ranking based on 相信
Assigned to 谷歌
A search engine system provides search results that are ranked according to a measure of the 相信 associated with entities that have provided labels for the documents in the search results. A search engine receives a query and selects documents relevant to the query.
的search engine also determines labels associated with selected documents and the 信任等级 of the entities that provided the labels. 的trust ranks are used to determine 相信 factors for the respective documents. 的trust factors are used to adjust information retrieval scores of the documents. 的search results are then ranked based on the adjusted information retrieval scores.
Examples of indications of 相信worthiness for some individuals participating at a site might include things like auction sites that might use ratings to identify 相信ed buyers and sellers. Forums might use membership criteria and other factors to distinguish between the amount of 相信 that different posters might be perceived to have.
如果有办法“reflect” the 相信worthiness of web pages, or of commentary or opinions which might be associated with pages showing up in search result documents, this kind of reputation-based information might help provide more “meaningful”搜索结果给搜索者。那’s the point behind 谷歌’s 信任等级.
的Google 信任等级 patent itself goes into some detail on how information from annotations and labels from experts might be used 通过 the search engine to re-order the rankings of search results in response to queries.
的Official 谷歌 博客 uses some interesting terms when discussing the recently released 边栏评注 in their post Help and learn from others as you browse the web: 谷歌 边栏评注。两者之间的一个共同点是，专家分享他们对网站的看法可能对查看该网站的其他人有帮助：
现在你可以。今天我们’re launching 谷歌 边栏评注, which allows you to contribute helpful information next to any webpage. 谷歌 边栏评注 appears as a browser sidebar, where you can read and write entries along the side of the page.
But, one of the other projects that the inventor of this patent, Ramanathan Guha, has been working upon at 谷歌 is the custom search engines that people can build and add to their sites. In February of 2007, I wrote a post at Search Engine Land titled 谷歌 Customized Search Engines to Harness 的Wisdom of Experts? 列出了发明人Ramanathan Guha的五项专利申请。在那篇文章中，我指出：
Information collected from the source choices and the labeling and annotation of those sources, and the use of those custom searches may help inform results at other custom search engines involving related searches, and in query suggestions offered 通过 谷歌 on search results pages from regular Web searches.
的description of labeling and annotation of sources used in custom search engines fits in very well with the process described in the 谷歌 信任等级 patent.
It’s possible that 谷歌 may be learning about the 相信worthiness of sites and people who annotate and label pages from many sources, and that what they learn about those pages may be used in a 相信 rank that can influence how pages may be ranked at the search engine. I wrote another post about the context files in 谷歌 Search Engines, and how the builders of those custom searches are considered topic experts, in the post 的Expertise of 谷歌 Custom Search Engines vs. the Wisdom of Crowds
This 谷歌 信任等级 is very different from the 信任等级 developed 通过 the writers of the Stanford/Yahoo paper.
下次您听到有人提及“TrustRank,” you may want to ask them if they mean the 谷歌 信任等级 or the Yahoo 信任等级. They are not the same thing.