http://www.newyorker.com/online/blogs/elements/2014/02/through-a-face-scanner-darkly.html Hat tip to Michael Z Williamson from a few days ago on facebook
People are getting paranoid of all the crap that might/will happen with google glass, but I think it's just a prelude. Someday there will be implanted computers, wired right into the various parts. Sure, google glass can be banned from being worn, but how do you ban something implanted into people's head?
There's a reason a lot of speculative fiction about the future is dystopian. The more and more integrated everything gets, the harder it will be to keep it all secure, and there will always be people who want to violate your privacy. Sure, cell phones can be powered entirely off, but once you've got cyberwear you're pretty limited in turning it off, unless you can hard disconnect the wireless interface it's bound to have (autistic mode, in Ghost in the Shell parlance).