Hi to anyone,
this is a sort and simple review of chapter one from the book Socialnomics, by E. Qualman.
Word of Mouth goes World of mouth
Word of mouth is the most effective form of marketing, though it has some imperfections and limitations; (i) information can be slow to spread, (ii) original information can be changed or distorted and (iii) you migth not know much about the source, what do not legitimate de original source of information.
Social Networks fixes this adding scalability and identity to the source.