<P> Grapevine communication existed from the American Civil War to the First World War . It was coined this because of its nature of networking and reaching several at once; it causes the transformation of information between one individual and another . </P> <P> Flexibility: There is no formal control over grapevine, so it is more flexible than other forms of communication . This also makes it more vulnerable and problematic, as one cannot send a message to any specific person, but is rather putting faith in the vagaries of luck, having no idea how many people, or who, might eventually hear the communication . Compare this to sending a letter to a person, or telephoning them, for example . </P> <P> Rapid communication: It is faster than many other forms of communication such as the postal service or posting bulletins . </P> <P> No record: There is no evidence which can be documented for future reference </P>

Where did the term heard it through the grapevine come from