On the non-general links in SEO

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Do SEO are concerned about the normal writing in the <a href=http://www.360.gov.cn> tags in the link.

Online also has a lot of unusual, hidden link form, webmaster World This post is listed a lot of kinds. This post only two pages, but there are many administrators, moderators appear, which is very rare.

These hidden in the normal sense of the link, whether the search engine found pages, transfer weights, page rankings have influence?

Links that appear in Gmail, for example, are tracked by Google. Click on the link in Gmail, you will see the Address bar first appears in the tracking code, and then to the real email link. So far there has been no indication that links in Gmail will help with the pages, let alone the impact on rankings. But if Google has never thought about using this data, why should it be tracked from the start?

These generic links include:

1 Other websites link to your pictures. Some sites will hotlinking pictures, misappropriation of traffic, but also may give you a link.

2 link to JS file.

3 link to CSS file.

4 links to RSS feeds.

5 Search engines can see the links in emails, such as Yahoo Mail, Hotmail,gmail.

6 links with Noindex.

7 links with Nofollow.

8 The URL that appears in the JS script or JS annotation.

9 URLs that appear in CSS or CSS annotations.

10 The URL that appears in the image and video file meta data.

A URL that appears in an HTML file comment. As：

HTML file header, meta data, and ALT tag where the URL appears. such as::<!--http://www.rigeng.com-->
13 links and pages that can be tracked by the toolbar by the user.

14 You need to execute the JS script to see the target URL.

15 The link in the paid content. The webmaster can set up the webmaster tools so that Google can crawl the links that need to be logged in to see.

16 made a link on the 301-turn domain name.

The links in Flash.

18 text not in the URL, such as http://www.265.gov.cn

19 Non-web files, such as world files, links in pdf,txt files.

20 Use a robots file to prohibit crawling of links on pages.

21 Domain name registration data and DNS data.

22 links appearing in Web Forms.

23 links to other gadget software.

24 non-traditional pages of links, such as Twitter, Yahoo, Google Forum and so on.

25 links to ads such as Google AdWords and other services, such as Google Maps.

26 Finally, I want to emphasize the links that may appear in the picture. We all know that search engines are not understand the picture, which is why do SEO all emphasize text content. But recently Google has made a lot of progress in image processing.

Google bought a photo-processing company A few years ago, and recently has a new twist in the areas of color, type, and facial similarity. Can you identify the URL from the picture? If so, can the advertising URL appearing in the Street View photos of Google Maps be read? This is probably one of the directions Google is also studying.