Fifty years ago, it was a paradigm shift for PR - decades before anybody knew exactly what a paradigm shift actually meant. It was March 8, 1954. From his living room, an entrepreneur named Herbert Muschel sent out a two-page announcement for his new company.

The idea seemed modest - cajole Big Apple publicists to start sending news releases to New York media outlets through a new PR service that distributed news instantly by teletype to newsrooms across the city. And ...