1. An image analysis method, comprising: receiving a first image captured by a camera-equipped cell phone, the first image depicting an object; determining one or more textual descriptors relating to the depicted object in the image, said determining including collecting textual descriptors associated with one or more other images; processing said textual descriptors in discerning whether the first image depicts an object that is likely of a first class or a second class or a third class, said processing being performed by one or more hardware processors configured to perform such act; and taking an action dependent on whether the first image depicts an object that is likely of a first class or a second class or a third class.