Idea that many other people dont have. If it is already on this thread, i dont care. It goes a little something like this:

So you click on a person and you go to more actions and you click trade and you click what you want to trade them with and there are 2 popups saying are you sure in case and then a pm shows up for them and they get to accept or decline it and you both recieve what you traded. There should also be a 5 minute refund somehow or you get are you sure poups in case someone clicks yes when you trade a scary face for on bullet for example.