Man may have evolved leaps and bounds but the collector’s spirit lives on in a lot of people. The Fiender iPhone app hopes to tap into this side of us. This social-network-cum-marketplace is home to a diverse archive of collectibles. It allows you to upload photos and videos of your collections to show off to fellow Fienders. Or you can sell or trade items from your collection as well. The free app has its unique appraisal feature that provides you with crowdsourced value of your items. You can download the app from iTunes or find out more about it on their site.