Link exchange network
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One of the main aspects of search engine optimization is link popularity, which is determined by the number of links from other sites that point to a site; more quality links are a better situation.
How can one achieve this? Webmasters manually trade links with related sites. This, however, can be a very time consuming process: you send emails to webmasters asking them to trade links; then you wait for their response. This process is slow and tedious.
Link exchange networks appeared to solve this problem.
There are a number of networks available. The common feature of these networks is that links are served by a server side script. This script fetches links from the main server and places these links within the site's HTML code. As a result, static links are established.
Link exchange networks can be considered a linking scheme. Google advises web masters to stay away from linking schemes: a quote from Google Webmaster Guidelines, "Don't participate in link schemes designed to increase your site's ranking or PageRank". Manual link exchange could be considered as a linking scheme too. Sometimes it is very hard to distinguish between Black Hat SEO and White Hat SEO methods.
