Show HN: Feedback on app/website http://zapaang.com

I am looking for feedback from the community to see if this is something you would use. Zapaang arose out of a personal need where we had items lying around that we dont necessarily want to sell but would give it to friends or neighbors if we knew they were looking for something similar. We werent keen on posting about it on Facebook and spam our friends with things that we have for sale as our work friends might not be so interested in my used diaper genie for sale. Neither did we want to post on craigslist and having to deal with people we dont trust. Zapaang explores the idea of what if you had a way to list, share and invite people to view things that you know will be relevant to them. Zapaang banks on the trust factor by building on top of a user’s existing social circle on Facebook. Facebook groups is a logical extension to that group where a group of people with similar interests post messages relevant to that its members. We started off with a version of Zapaang where you can list, discover and interact with items posted by your facebook friends or shared with facebook groups you belong to. The app is available on the iPhone store and the Windows Phone marketplace. For more information you can visit http://zapaang.com