This document discusses blogs and their potential as a tool for word-of-mouth marketing. It notes that the blogosphere currently consists of over 35 million blogs that are doubling in size every 5-6 months. Blogs can spread information quickly and exponentially due to their interconnected nature. However, with so many blogs it will be difficult to read all information, and opposing views may also spread. Whether blogs are the definitive word-of-mouth tool depends on one's perspective - bloggers say yes, traditional media may say no, and it is up to users to decide in the new world of Web 2.0.