Exchange Links _ Quality of external links

Extended external links is about quality rather than quantity, this point of view many SEO are very much in favor of, think billion Europe has repeatedly stressed. Prior to this, SI billion also wrote an article on the exchange of links to the SEO external link Exchange Guide tutorial. That article is also about the quality of external links, but only on the one hand.
How to judge the quality of a link needs to be based on the other site of a number of factors to observe, the simple PR value can not represent the quality of the link.
For the quality of external links to judge, basically can be based on the following factors:
Site Content Update Frequency
Can observe the content of the other site update frequency, keep the regular content update frequency, spiders will visit the site frequently.
Site Rankings
Random sampling to observe the other site's main keywords, two-level keywords, long tail keywords and other rankings, to understand the weight of the other site.
Website content Quality
The content quality of the other site, the original content of the majority or collection, reprinted mainly.
Seospam
Very simply, the website can not be cheated or have cheat traces.
Export Links
Each other's home page includes the number of export links, the quality of the exported links, the proportion of high and low quality links. If the first page to export a lot of links, quality is not good, as far as possible to avoid exchange links with this type of site.
Site dependencies
Website relevance is the search engine used to judge the quality of the site is an important factor, but also the focus of SEO. Therefore, when expanding external links, the first type of link you need to find is the site associated with your own topic.
For example, the site (www.111cn.net) to find the type of link, technology, resource classes.
For the quality of external links to judge, you need to observe the various factors of the site, the purpose of exchange links is to improve the weight of the site, improve the ranking of the site. With high-quality website Exchange links, can quickly improve the ranking of the site.
A high quality website link does not have any effect, but if accumulates to 20, 30, 50 high-quality website link, you can discover your website to perform very good in the search engine.