> It’s a cool thought experiment for nerds and paranoiacs to imagine how you might use relative wi-fi strengths I'm honored to be called a nerd on HN... I'll i

> It’s a cool thought experiment for nerds and paranoiacs to imagine how you might use relative wi-fi strengths I'm honored to be called a nerd on HN... I'll ignore the latter ;) Though while I agree the phone number is absolutely used, I don't think it's the only. Trying to get out ahead of the public's changing privacy tastes is a must for any advertiser that collects social-graph-like data. So strategically, if FB is not doing this, I would pull any FB investments because they aren't trying to do their job.