The Gift Card Exchange App by CardHub on Facebook is a free tool that lets you list gift cards you don't want for all of your friends to view. You can also browse through the list of your friends' unwanted gift cards to find a potential trade or sale. The service is entirely free and operates on the principle of trust rather than verifying gift card balances before the sale. The use of trust is why your gift cards are only seen by your friends and vice versa.
While the tool is very useful if you have friends also using the Gift Card Exchange App, you won't see the immediate availability of trades and number of individuals you would find on other gift card exchange websites. But, the ability to do the trades for free and often exchange for a gift card of the same value are significant reasons to try out the Gift Card Exchange App. Couple that with the fact that Gift Card Exchange lets you trade gift cards for small local businesses that typically can't be listed on many big sites, and you have a great way to get rid of unwanted gift cards.