For all of the other things it does, Google is still a company that makes a ton of money from advertising, and now it's turning that focus to TV. This week the company announced that it's testing a new kind of ad-tracking system for Google Fiber TV customers in Kansas City. Just like any other local cable company, they'll air during ad breaks reserved for local advertisers (that crappy ad for the car dealership around the corner that comes on during The Walking Dead). Where it's different is that advertisers will only pay for the number of ads actually shown, as monitored by the Fiber set-top boxes. Google can insert fresh ads in DVR'd programming too, and target viewers based on their viewing history. Users can opt-out of the viewing history tracking, but that's it.