Should face-detection be used in San Francisco bars?

dnt kgo bar age app _00004523
dnt kgo bar age app _00004523


    App records age, sex of bar patrons


App records age, sex of bar patrons 01:20

By John D. Sutter, CNN

Check out this video from CNN affiliate KGO, which profiles an app called SceneTap.
The gist is that the app works with surveillance cameras in bars to report the number of men and women who are at a  watering hole at any given time -- and their average ages. The upside: You could go to the bar that has the mix you're interested in. The downside, as an Electronic Frontier Foundation representative tells the station, is that this could cut down on privacy.
The app's creator says he doesn't store face-detection data -- only the gender profiles of bar patrons.
    Creepy or helpful? Let me know what you think in the comments.