The webmaster usually analysis to the data exchange in Links

chain of great site weight, if the other site has a large number of the chain, then the weights of the site should not be bad, outside the chain of a site also reflects this station on the site of the maintenance and promotion. If a site has dozens of the chain or 180 links, that this site is basically no how to promote, so this site is not got the attention of webmaster. So the number of the chain the other site should not be too little.