Well I'm from Canada so I can't use it online. On other gift card giveaways, they usually let you use it if you show them an email or on your smartphone or something?
Not to be racist or rude or anything, but I just noticed that in the picture, the hand that is holding the gift card is light skinned, but in your picture and Facebook you are dark skinned. Is this actually your picture?
On your Facebook that is connected to Listia, the profile pictures after the one that is your best friend are different pictures or another dark skinned individual, and the people commenting refer to it as "you". Not trying to dig into your life or anything, but I just don't want to get scammed. If this wasn't your picture, you could have just said so. and then explained.