In 8,000 BC, the first form of fired clay tablets were used to record transactions. Neolithic people used these tablets to record transactions of farming products like oil and grain. This is an early form of communicating as well as printing and one of the earliest ways of recording information. This method was used until around 1,500 BC which shows how long it stayed popular and effective.
For more discoveries in ancient communication, see:
Source: Brian Bunch and Alexander Hellemans, The Timetables of Technology A Chronology of the Most Important People and Events in the History of Technology (New York: Simon & Schuster, 1993), 17.
Image Source: “Babylonian Mathematical Tablet,” Jeremy Norman’s From Cave Paintings to the Internet: Chronological and Thematic Studies on the History of Information and Media, http://historyofinformation.com/images/babylonian_mathematical_tablet.jpg (accessed December 14, 2011).