I buy stuff on line from time to time. When I internet shop I normally check out several sites and compare reviews. Google knows this. Google tracks all of this and then Google tailors my "add experience" to reflect this.
Recently I decided I wanted a new pair of shoes for work. My favorite maker of these kinds of shoes is Allen Edmonds. So I checked out what they had available on their web site. I've been a customer of Allen Edmonds for about 20 years. So if they have what I want, I'm very likely to buy it from them. As I was surfing the web site, I discovered that several models were on sale. This company doesn't have sales all that often so I picked out what I wanted and ordered it.
For me that's it, transaction over. I've bought my shoes. If they fit when they show up tomorrow, my quest for shoes will be over and it will be a few more years before I get the urge to shoe shop again. Its never over for Google Ad Sense. I can't surf any web page with out seeing adds for Allen Edmonds shoes.
Example #2. I'm told (by those that love me enough to buy me gifts) that I'm "hard to shop for". Whatever that means. So I am required to provide lists of stuff I want for Christmas. This last week I preformed my annual "list chore". The best way to do this is to make a list and provide links to the items in question. The fastest way to provide links is to Google the stuff I want and link it. This year I asked for (among other things) some commercial grade kitchen items. So now I'm bombarded by shoe and restaurant supply ads.
In college I was a marketing major, so this internet based targeted advertising interests me. I like everything about it from a marketing prospective. One question that I have about the process is, "when do they decide to quit the targeted campaign?". I've bought my shoes. Unless something happens, I won't buy more shoes for some time. Do I have to shop for something else in order to see new ads, or am I stuck with the ads? Isn't that a waste of advertisers money and a wasted opportunity for some other advertiser?