That is going about it the right way to start. You will get a veritable plethora of responses. Everything from "You're an agent? *CLICK*" to "Sure let us send you some"
We love birthdays, when's yours?
Will not be displayed on your profile. (Why do you need my birthday?)
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We will never reveal your name to the person you ask.
Even if you hide your name, keeping Formspring fun is still your responsibility.