Adware that manipulates google search results.

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Think your safe while searching Google? Well the bad news, is that sometimes you maybe not be aware that the Google results you are getting have been altered to benefit the growing adware/spyware industry. If we didn't have anything else to worry about in searching the net, there appears to be a form of adware that is able to hijack google results and insert ads to make them appear as if they were real results. At the last second right before the search is completed it alters the results just slighty. Most would not notice this. Disturbing yes...Relevant no way...A big problem yes for organic results.

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http://www.seroundtable.com/archives/000556.html