Verify Name Via Facebook?

[MsTri]

Can someone please clarify:

If you verify your name, does that automatically change your user name? Or is there a way to verify your given name yet keep your user name?

I have resisted verifying my name because I don't want to be forced into using my real name as my OBC alias. Yet, one can only become Level 6 by doing so...which also makes me wonder what do people who don't have a Facebook account do, or people whose FB is less than two years old? Or people who use an alias as their FB name?