This document discusses different types of blogs and how companies can use them. It outlines internal blogs for collaboration, knowledge sharing, and culture building, and external blogs for marketing, PR, customer relationships, and brand building. Examples include Nike using blogs to discuss basketball and Jonathan Schwartz of Sun Microsystems having a CEO blog. The document provides tips on using blogs to accomplish business objectives like marketing and market research by connecting with customers. It also warns of potential mistakes like not being clear or failing to encourage comments.