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Fraud and unfair linking tricks under link exchange
The Internet is big, and there are always people/webmasters who would want to deceive you and gain advantage. The essence of the deceit is to get as many incoming links as possible, without giving anything back. The ways to achieve this are numerous: Invite you to link exchange, reciprocate, then simply delete your link Dumb but effective way against people doing the exchange manually. When you have say, 300 outgoing links, checking them all will just consume all of your time. One day, you just drop it, expecting people to treat you fairly. Come into link exchange without really reciprocating It is technically possible to make a link be visible on a page for a human, but still keep it invisible from search engines. This can be achieved through different ways:  Set link to you on a page with 500 or more links. Such a link will not be useful, as search engines, as they say, recognize only first 50 to 100 links on a page. Create a JavaScript link. It will be visible in the browser, but search engines will ignore it as non-existent. This is easily caught by Automated Link Exchange crawlers which don't implement JS scripts, and by humans by viewing the HTML code of the link page. Link relocation trick. You came into link exchange. Then, you partner starts moving your link from one page to another, say, once per month. Search engines just cannot catch up finding your link. Strictly speaking, your link is there, but you don't benefit from it. Robots.txt trick. Using this file, you can keep search engines from crawling certain parts of your website, for example, Link Directory. This means that the link is there, all looks fine, but Google will never find it. This trick cannot be detected by crawlers unless they can read robots.txt file. It is difficult to detect for humans, because malicious exchangers can arrange their robot.txt to be modified on a regular basis, or randomly. One of good solutions can be to set monitoring of partner link pages whether they are in Google's index or have a PageRank. Read articles...
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