google Matt Cutts 的SEO 定律分析
以下是stuff Matt Cutts曾经说过的，我将其罗列出来：
1. http://www.mattcutts.com/blog/dashes-vs-underscores/Matt recommends using dashes over underscores to delimit words in urls. 2005.Google does not algorithmically penalize for dashes in the url despite the fact that some have raised it as a possible heuristic for spam detection. I think WordPress pretty much precludes this anyway. 2005.
连接网址(URL)的下划线，尽管有些搜索引擎已经将其视为不利于SEO，但是google并不是这么认为的。
2. http://www.mattcutts.com/blog/seo-mistakes-sneaky-javascript/Google takes action on individual instances of spam when they find it, but they focus on creating better algorithmic solutions. He states that he would not recommend using sneaky JavaScript redirects because your sites may get nailed in the near future. 2005.
3. http://www.mattcutts.com/blog/whats-an-update/Google updates their index data — including backlinks and PageRank all the time. However, they export and publish new backlinks and PageRank data approximately every three months. New backlinks and PageRank are meaningless — it is not an update. The information is likely already factored in for awhile before you see it. 2005.
Google是一直在更新主文件信息（包括backlinks和PageRank ）的，但对外公布或者将其体现在网上的时间大概是每个月更新一次，所以，每次看到的backlinks和PageRank 其实都是已经过期了的。
4. http://www.mattcutts.com/blog/seo-mistakes-nearly-hidden-text/Hiding text using similar colors and background colors can actually be worse than using the same colors. Using “#EEEEEE” instead of solid white on a solid white background can look worse — as if you’re trying to hide it. I suspect this is a heuristic for detecting hidden text. 2005.
隐藏文字看起来比较糟糕
5. http://www.mattcutts.com/blog/q-a-thread-march-27-2006/If you sell links, Matt says you should use link condoms. Otherwise your reputation may fall. I assume this means they will devalue your outbound links. 2006.
如果你要卖链接，那么做好做点安全保护，因为，卖链接有可能使你的价值贬值。
6. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Googlebot can only crawl the free portions that non-subscribed users can access since it does not log in. Therefore, be sure to excerpt material in the free version that offers value. Vanessa Fox. 2006.
Googlebot只能爬行到普通访问者能访问到的内容。
7. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/If you must use Flash, you must also make an HTML version available as well. Block the Flash version from the crawlers with a robots.txt file. Vanessa Fox. 2006.
如果你一定要用Flash，那么最好也有一个HTML版本的内容，因为Googlebot对flash内容并不会抓去，另外，你需要将“阻止googlebot爬行flash版本”的信息写进robots。
8. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Use user-friendly URLs like “african-elephants.html,” and not “343432ffsdfsdfdfasffgddddd.html.” Don’t overdo it either — african-elephants-and-their-habitats-etc-etc-etc-etc.html. Vanessa Fox. 2006.
站长能把URl链接做的比较友好，越短越清晰越好。
9. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Assign unique, descriptive
10. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Minimize the number of redirects upon hitting a URL. Vanessa Fox. 2006.
11. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Minimize the number of URL parameters — 1-2 parameters if possible. Vanessa Fox. 2006.
12. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Don’t use a parameter named “id=” in a URL for anything other than a session ID. Otherwise, it may not be included in the index. Vanessa Fox. 2006.
不要在url中使用到“id”，不利于seo
13. http://www.mattcutts.com/blog/guest-post-vanessa-fox-on-organic-site-review-session/Earned-links are earned and given by choice. Google does consider buying text links for PageRank purposes to be outside our quality guidelines. Vanessa Fox. 2006.
14. http://www.mattcutts.com/blog/google-analytics/Blackhat SEOs may be leery of using Google for analytics, but regular site owners should be reassured. Vanessa Fox. 2006.
15. http://www.mattcutts.com/blog/text-link-follow-up/Google’s is against selling/buying links, and Matt indicates they are good at spotting them — both algorithmically and manually. Sites that sell links can lose their trust in search engines. 2006.
16. http://www.mattcutts.com/blog/seo-mistakes-spam-in-other-languages/Google is focusing on detecting spam in other languages in 2006 — Italian, Spanish, Chinese, etc. 2006.
17. http://www.mattcutts.com/blog/seo-advice-discussing-302-redirects/External (domainA -> domainB) 302 redirects are largely treated as 301s now. 2006.
18. http://www.mattcutts.com/blog/seo-advice-url-canonicalization/Canonicalization is the process of picking the best url when there are several choices, and it usually refers to home pages — http://www.example.com/ vs. example.com vs. www.example.com/index.html. Since all these urls are different, a web server could return completely different content for all the urls above. When Google “canonicalizes” a url, it tries to pick the best one and elimintes the others. To help Google, link to resources on a site consistently, and use 301 redirects to enforce it. 2006.
19. http://www.mattcutts.com/blog/seo-advice-url-canonicalization/Do not use the URL removal tool to remove domain.com if you are worried about URL canonicalization and have both domain.com and http://www.domain.com/ in the Google index. This will remove the entire site. 2006.
20. http://www.mattcutts.com/blog/seo-advice-url-canonicalization/Search engines can perform canonicalization for things like keeping or removing trailing slashes, upper vs. lower case, or removing session IDs from bulletin board or other software. 2006.
21. http://www.mattcutts.com/blog/sitemaps-interview/404s (Gone, but may reappear) are treated the same as 410s (Gone, but will not reappear). Most web masters use 404s as 410s anyway. 2006.