Start with a bartering idea of helping out a poor person or family in order to get them a better place to live, or a newer, more reliable car, etc. There needs to be a specific goal in mind. Describe the idea and goal, and reason for trading up each time. For instance, I could start out by bartering a bottle of wine for something of more value. Put it out there for someone to trade for. The ideas are endless. I have heard of people doing this for themselves, but I am suggesting we do this to help someone else.
Start a facebook page, blog, with a link that describes the objective. It must be a real person or family that is in need. Putting a picture of them with a description might be helpful. Share links with friends and others who might be willing to barter--for fun and with a charity goal in mind.