Link -you need to get 4 friends to sign up for free. It says in the info that this card can be used anywhere American Express is accepted, so it’s not just for that mall they mention.
–UPDATE-They’ve changed the description of this item to specifically be a Northgate Mall Gift Card. I dont know if the people who signed up before they changed this will get the AMEX or the mall GC, we’ll have to wait and see.