From Media Technology and Culture Change

The word blog is a combination of the words "Web" and "Log." The word "blog" has also evolved into a verb, referring to the act of adding or creating content for web logs.

Blogs are as diverse as the internet-using population itself, often providing commentary or analysis of subjects ranging from politics to personal experiences. The interface allows text and images, as well as links to other web sites related to the subject. This facilitates rich presentation of subjects with only a few clicks of the mouse. For example, a commentary on a recent political speech may provide an embedded link to a video of the speech on YouTube, or link to an article about the speech in the New York Times. Blogs also act as online diaries, where bloggers feel comfortable spouting opinions, funny stories, personal problems; a blog serves to help create a person's online identity.

Readers of most blogs are given permission to comment in an interactive computer interface format which is then visible by all subsequent readers. This lends a sense of community to many blogs and promotes the concept of web 2.0.

"In May 2007, blog search engine Technorati was tracking more than 71 million blogs."[1]