How many of these types of money in our past do you use? No doubt, you can add a few more to the list. Not everyone agrees that Facebook credits are a form of money. However, the people who use Facebook credits to transact a deal certainly see it as money and use it as money. Now, so much of our society is dependent on energy.
The earliest form of money was straight one to one barter. Salt, copper, bronze, shells, gold, silver, rum, tobacco, grains, animals were all used. Farmers would trade their harvest for animal skins, for example. Barter was not convenient as you needed to find someone to accept what you had to offer.