Develop a platform where people who want to organize group purchase of home heating oil where they will trigger their Facebook friends to join as well. The more people sign in, the lower the price for a certain region.

Both buyers and oil supplying companies were able to create promo's for certain regions in Belgium.

Each supplier had to offer several price brackets for a certain volume.

When viewing the platform on Facebook, you'll see directly your Facebook friends using the platform already and you get automatically informed if some of your friends ordered within a certain region so you can participate as well. Most important, people who start a region can invite their friends to sign up as well to get a lower price for everyone. This way you make the purchaser you own ambassador to spread the word within their network since the more people they trigger to join, the lower the overall price would be.