In 2011, online advertising has beaten out print and radio as the number two place ad dollars are spent. But how did it come to be that way? Four thousand years ago Ancient Egyptians invented advertising by carving public notices in steel. Fast forward to the present day, and in-text online ads, Facebook Like-driven campaigns and viral commercials, such as the Old Spice Guy, are common form.
Source http://www.mashable.com/