Given how absurdly ubiquitous Facebook has become (and how they ultimately give fuck-all about your privacy in the grand scheme of things), the folks at FB Bureau have gone ahead and begun printing Facebook identification cards. Quick, jump on the bandwagon before the Like Police come a-knocking!
Explains FB Bureau:
With more than 800 million users Facebook is the dominant identity system on the web. When signing-up for new services around the open web it's quite common to use Facebook Connect instead of creating a new user account. People stop ranting on blog comments because they only allow comments connected to your "real name" aka "Facebook Identity" (till the end of time). For the good or bad we are losing anonymity and Facebook Inc. is establishing order in this "world wild web" (for profit, not necessarily for the good of society).
Governments like Germany have released new passports that offer online identity checks as well, but they will likely never succeed with their technologies given the already existing structure of Facebook, powered by laziness (or convenience). The other way around though - A future where a Facebook Identity becomes more important than any governments' doesn't seem unrealistic.