It's similar to ebay, but instead of using money, everything is with Yerdle dollars. So you are encouraged to get rid of things you don't need in order to get things you would like. You can list your items or browse to get items. It's incredibly fun to hunt for unique items. You just pay tax fees and shipping when you order an item. Giving requires nothing, but dropping it off at ups!
I've been able to give my prom dress to an organization that gives them to teens that need them and to give my old tv show sets to new fans. I've gotten amazing things like brand new makeup, TOMS shoes, scarves, a coat, vinyl records, etc.