Okay, so here's a sweet stuff from Facebook. Have you upgraded your profile to the new Facebook Timeline yet? If not, then click here and follow the instructions there to get Timeline because I will show you how to get your Facebook business cards, for free!
Got timeline now? Okay. Here's how to get those cards. Enter http://facebook.com/yourfacebookusernamehere/info on your browser. If your username is neilrossgoco, then you should enter http://facebook.com/neilrossgoco/info. Now click the little tiny icon on the Contact Info box.
Now you will be taken to Moo to design and submit your order for free. Only the first box with 50 cards is free.
UPDATE: This is completely free, provided that you will choose the standard shipping option. I just ordered mine today and the shipping estimates is on February 14. Quite a long wait but hey, this is free! You can also choose the express shipping via DHL with a tracking for an additional £30 or something.