An Effect of a Transparent Society
At Chicago Boyz, they're worried about the combination of face-recognition software and social-media aggregation. This can be used defensively as well as offensively.
For example, if union goons surround your house (earlier discussed here) or slash your tires, we will soon know who they are.
Even if they're wearing hoods, we can use gait recognition (paid for by the Ministry of Silly Walks). A few years from now we might be able to use odor as well.
As a bonus, we will also be able to find runaway legislators … and anybody using Twitter to send death threats (there's bound to be somebody that dumb).
Hmmm… Right after the World-Trade-Center attack there were videos of people celebrating on the West Bank. Maybe the face-recognition software could be applied to them…