Are you tired of stories about tying online behavior to real-world store visits, Dear Reader? What once seemed magical now seems common. Still, it’s arguably the greatest revolution in marketing measurement since the dawn of mass media. In any case, here’s another one: Location data company Factual has launched a new product that correlates ad exposure to visits, using data from Factual’s graph of 300 million devices. Marketers can compare exposed to non-exposed groups to estimate incremental campaign impact.