I have 4 different Facebook accounts. One with my real name, that I NEVER use. It's there as a place holder.
I have an account for people from the gym that I play basketball with, and for that purpose ONLY. I have one that has NO data, but I use it to play xanga poker from time to time, and other facebook apps - no concern about privacy of data since that profile has no data, so the facebook apps can steal all the data the want.
Finally I have a private facebook profile that is used to interact with friends and family, where I do not use my real name. I use "AndroidFB" or something similar, just to goof around, share pix, etc. That way no strangers can find them and connect them to the real me. Friends and family know that it's me though.
May be a bit over the top in terms of guarding my privacy, but I don't trust Facebook so that's why I have 4 accounts.