From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-568553-815593
The early eating bars of chocolate were made of bittersweet chocolate. Milk chocolate was introduced in 1875 when Henry Nestle, a maker of evaporated milk and Daniel Peter, a chocolate maker, got together and invented milk chocolate, which today is preferred by 80% of the world's population.
This news arrived on: 06/20/2009