Well German artist Tobias Leingruber created an unofficial Facebook identification card. He calls the project FB Bureau.
The card contains your real name, username, gender, location and the date you joined Facebook. It also has a QR code that will redirect people to your profile once scanned. He prints and distributes these ID cards by himself and starting next month you can have your own Facebook ID when you see him at Berlin on the 2nd of March and Amsterdam at 16th of the same month.
Another German artist saw what Leingruber did and wants to do the same for Google+ members. Moritz Tolxdorff decided to create these identification cards after he was that a lot of individuals were interested in having one. He built Hangout Graphics so that you can easily create your own Google+ ID.
Unfortunately, these ID cards are worthless and it seems like less to nothing. But if more and more individuals would pressure Google and Facebook to adapt this, we might soon see a legitimacy behind this cards.
Facebook already uses a similar system during their conferences. So it wouldn’t be a surprise if they jump on the idea.