Google uses this as a key litmus test for which businesses it wants to enter - the media's reported on Larry's "toothbrush test", where he's only interested in products that get used at least twice a day.

This is also behind the increasing focus on traffic & turn-by-turn navigation in Google Maps, and the acquisition of Waze. Google Maps as web-based satellite mapping software gets used only once or twice per year, when you go on a trip to an unfamiliar location. Google Maps as a local business directory gets used once or twice per week, when you're looking for restaurants or coffee shops to meet at. Google Maps as a traffic-avoidance system gets used once or twice per day, to figure out the best route around jams.