A blog, for those who don’t know, is a journal or log that appears on a Web site. It is written on line, read on line, and updated on line. It’s there for anyone with an Internet connection to see and (in many cases) comment on. The entries, or posts, are organized in reverse chronological order, like a pile of unread mail, with the newest posts on top and the older stuff on the bottom. Some blogs resemble on-line magazines, complete with graphics, sidebars, and captioned photos. Others just have the name of the blog at the top and the dated entries under it. You can find blogs by doing a regular Google search for the blog name (if you know it) or by doing a Google Blog search using keywords.
The word “blog” is a portmanteau term for Web log or Weblog. In 1997 Jorn Barger, the keeper of Robot Wisdom, a Web site full of writings about James Joyce, artificial intelligence, and Judaism as racism (he’s reputedly a racist himself), coined the word “Weblog.” In 1999 Peter Merholz, the author of a Weblog called Peterme, split it in two like this—”We blog”— creating a word that could serve as either noun or verb. “Blog” was born. (The New York Review of Books)