When it comes to the sign up form for facebook, I notice that other than a person's first name, last name, and email, there's no way to ask for their birthday or other information on that form. When I click on "customize" button, the only option I see is to upload an image. I have edited my sign up form in the constant contact site to request this information, so I am wondering why when it comes to facebook, the sign up form does not show the extra items like birthdays or addresses?
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