>following someone around takes time. If you photograph them you have to develop film (and you won't know if the photos turned out until then). And while it may

>following someone around takes time. If you photograph them you have to develop film (and you won't know if the photos turned out until then). And while it may have been legal, social norms said don't stalk people It also required a minimum ratio of one person to one target to capture such information. The barriers to justifying round-the-clock surveillance of someone were far higher when such activity entailed paying for round-the-clock manpower. An individual would need to have made very wealthy or very determined enemies in order to demand such close attention but technology has lowered these barriers such that literally everyone with a smartphone is effectively under round-the-clock surveillance.