"In a sense, blog are like muffins. They are one shape, but the batter that goes into it might run the gamut from chocolate cake to bran. The same is true of social media forms such as Twitter or social network sites. They are ways of conveying information, but they do not dictate the nature of the content conveyed."

Blur: How to Know What’s True in the Age of Information Overload, Bill Kovach and Tom Rosenstiel