Two cans and a string

Two cans and a string is an entertaining way to communicate during the 19^th century. However, the distance between two persons communicating with each other is limited. In contrast with the new media of communication (social media) such as facebook, twitter, and blogs, where the distance is not limited and the communications is not only limited between two people.

Check this site on how “two cans and a string” works: http://science.howstuffworks.com/question410.htm