Link farming is a type of online advertising fraud where fraudsters attempt to: create a series of bogus Web sites, all linking back to a page, in the hope of increasing that page's results in organic search. pack a Web site with unrelated keywords in the hope of luring users who wouldn't normally visit a Web site. search keywords linked to rival ads in the hope of generating impressions without clicks to lower the performance rank of these ads. frame a rival by generating bogus clicks or impressions that appear to be associated with the rival, in the hope that this rival will be banned from an ad network. generate bogus impressions that can be linked back to a rival's ad to exhaust the rival's CPM ad budget.