You'll need Firefox or Chrome browser with developer kit. Also, if you have Alexa toolbar extension running in your browser as well that helps. - Go to a High PR Authority site on scammers or poor service providers. For the big mind fudge, find a Gov site on scams etc. - Navigate to a section on shoddy businesses. -Right-click on an outgoing link and in utilizing Chrome dev toolkit, Choose "Inspect Element". -Re-edit the outgoing, d0-f011ow link and insert your competitors url. -Change the link text to something appropriate or to your amusement. -Close Chrome dev window and click on link. Repeat in Firefox a few times as well and use as many High PR sites as you can for added effect. -Rinse and repeat on page 1 links of a google search of "poor service providers for ______" or whatever your whim dictates. Sure enough sooner or later your competition will start to notice High Authority, High PR links with unflattering link-text. These links will come and go at random leaving no trace as to how they came to be. I tried this on my own site with positive keywords and it showed up in my G analytics but because the links aren't there on next crawl, they aren't of much SEO value and show up as lost links.