Interesting, I never thought of having a username on fb. I use my first and married last name. I haven't gone by my maiden name for a long time, so why use it? Besides, if someone for the past wants to get a hold of me I have the high school that I graduated from in my profile, along with a picture of myself. I'm heavier, saggier, and grayer than I was way back when, but it sill looks like me.
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I have about 65 friends, and that is a good number for me.
But I think it needs to be said again...be careful about what you put on fb or any site. I don't list where exactly I live...just the general area. I have some friends that have their home addresses and phone numbers in their profiles!
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I never state that we are going away until we have come back home, and I'm very careful about what I post concerning my children.
Besides, there are always emails and PM's if you want to share additional information.