I've developed a new buy & sell app with which you can buy & sell used or unused stuff with your friends and friends of friends.
The app is called Tradely: https://play.google.com/store/apps/details?id=com.newbuysellapp.byhammad.buysellapp and can be summed up as Tinder + eBay.
Please let me know your views, suggestions and feedback.
Thanks!