On Wednesday, October 05, 2011, Facebook filed with U.S. federal trademark a registration for the usage of "Facebook." The Facebook trademark is filed in the category of paper goods and printed material, advertising, business & retail services, treatment & processing of materials services, personal & legal & social services, "non-magnetically encoded" ID cards among other things.
The description provided to the USPTO for FACEBOOK is Cards, namely business cards and non-magnetically encoded identity cards.
Cards, namely business cards and non-magnetically encoded identity cards
Business card and identity card design services
Facilitating social and business networking through the provision of data for use on business and identity cards
If and when granted the trademark would protect using the word Facebook in the specified formats, not any actual invention.
In addtition to above mentioned categories, it looks the "trademark would also cover QR code and NFC/RFID uses -- which work through magnetic induction, NOT the aforementioned magnetic encoding -- much like the Presence cards and photobooths that allowed you to upload and tag photos at F8," revealed TechCrunch(pic).
So will Facebook play a larger role in how we manage in our offline identity in the future?