02.26.07
Hiding PPC links from Googlebot, MSNbot, Yahoo Slurp
Pay Per Click Sponsored links are usually not followed by the search bots, but there are instance when this may occur. For Example, your tracking links may have been copied to a crawable web page. This happens all the time by site administrators and by META search engines (engines that feed off other search engines). If your tracking URLs keep showing up in the Search Engine Result pages (SERPS) by the major search engines you can remove them by adding a couple of lines in your robots.txt file.
Google, MSN, and Yahoo all respect the robots. Assuming that your tracking URL have “leadsource” in them. This would be the code to remove them.
User-Agent: *
Disallow: /*leadsource=YahooPublisherNetwork
