As adsense becomes the most popular publisher program for Price per Click advertising, flaws and disadvantages still exist. Since its inception advertisers have chosen to advertise in search because they felt that visitors would be less targeted. This is a genuine concern and one that makes perfect sense.
Identifying and tracking examples of click fraud is the first step to eradicating the problem. Click fraud is an enormous drain on the resources of advertisers operating on a national and international scale, estimated to occupy around 30% of all pay per click advertising spend.
When advertising with pay per click Google gives the advertiser two broad options. Advertising in search results, advertising in websites content or indeed many choose to do both. Advertising in search means that results are displayed in Google under searches, and in its distributors search results.