Download Firefox.
Install addon named SeoQUAKE
Login to google, and set number of results to 100.
Allow SeoQUAKE to show bar in search results, and to show nofollow link in other color.
In google, search for your targetted keyword.
Sort results by the PR number of the page by clicking ? sign
Search where you can post your comment, on high PR, relevant website.
To get more High PR pages, use other links from comments to see where your competition is posting by typing in google:
link:http://competitor-domain-name.com
Always comment on relevant pages, with relevant comments. Start with PR3. Don't do more than 10 links daily. Never on pages that are nofollow, useless. In 3 weeks, you will see results.
That would be one way
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Other than that, you can use footprints, to search certain type of web platform, or domain, for example:
site:.edu /phpbb/
Powered by SMF
Inurl:.edu Powered by BlogEngine.NET 1.4.5.0?
etc...