While signs of advertising are detected in ancient eras, its biggest boom came around the mid-19th century in capitalist economies, through the use of newspapers and magazines. Radio and television commercials during the 20th century increased the saturation of ads, covering every bit of blank space possible with marketing campaigns. The 21st century is no exception to the evolution of commerce. Social media is now the leading platform for advertising. If you're business is still focusing on traditional forms of marketing, your campaign is officially outdated.