Von Bakanic, a sociology professor at the College of Charleston, pointed out that the definition of good etiquette is constantly evolving.

Today, we have cell phone and email etiquette. The delivery of handwritten thank-you notes is no longer the norm.

“There are so many new technological changes that have caused us to need different rules for interaction,” Bakanic said.

http://www.postandcourier.com/news/2011/nov/14/what-happened-to-our-manners/