This document provides an overview of blogs, including their history, key statistics, demographics of blog readers and creators, and how companies can use blogs. Some key points include: blogs first emerged in 1999 and have grown dramatically, with over 17.8 million identified blogs currently; blog readers tend to be younger, wealthier, and spend more time online than average internet users; and companies can use blogs to gain consumer insights, improve their brand, engage in word-of-mouth marketing, and demonstrate thought leadership.