关于rel=”nofollow”

Google在Webmaster Tools页面提到:

“Nofollow” provides a way for webmasters to tell search engines “Don’t follow links on this page” or “Don’t follow this specific link.”

What are Google’s policies and some specific examples of nofollow usage?

  1. Untrusted content
  2. Paid links
  3. Crawl prioritization

However, a solid information architecture — intuitive navigation, user- and search-engine-friendly URLs, and so on — is likely to be a far more productive use of resources than focusing on crawl prioritization via nofollowed links.

html5对rel=”nofollow”的解释道:

rel=nofollow “indicates that the link is not endorsed by the original author or publisher of the page, or that the link to the referenced document was included primarily because of a commercial relationship between people affiliated with the two pages.”

综上来看,不管是从搜索引擎爬虫的角度、还是html5对此的重新定义来看,rel=”nofollow”并不是单纯用来屏蔽搜索引擎抓取的。它包含的语义远大于原先的定义。