The good news is: Facebook would have to use a 4 letter keystroke, increasing their calculation need by ~33%
...
I still cant wrap my head around that. That's beyond my wildest dystopian Sci-fi scenario. Reality is so much cooler than fiction:
A computer heavy society where whatever you type you're identified on the spot, your localization is known, an health and economical portrait is traced... All that just to sell you some soda. I just cant.
Uhm... your link demonstrates that Philips has the patent, and has had since 1997.
Amusingly enough, it was created by Michael Whelan, who is probably a different Michael Whelan than this dude.