I notice that after looking for new boots a few days ago,( I went onto Ebay and then googled a search for "womens boots") all the sidebars on answerbank and other sites I visit are all related to boots, including the other websites I went on. Is this what's called Viral Marketing?
If you have Firefox,there is something you can download called Adblock-it blocks all advertising. If you type 'adblock' into the search bar here-a number of relevant posts will come up.