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Before blogging became popular, digital communities took many forms, including Usenet, commercial online services such as GEnie, BiX and the early CompuServe, e-mail lists] and Bulletin Board Systems (BBS). In the 1990s, Internet forum software, such as WebEx, created running conversations with “threads.” Threads are topical connections between messages on a metaphorical “corkboard.”

The modern blog evolved from the online diary, where people would keep a running account of their personal lives. Most such writers called themselves diarists, journalists, or journalers. Justin Hall, who began personal blogging in 1994 while a student at Swarthmore College, is generally recognized as one of the earliest bloggers, as is Jerry Pournelle.[citation needed] Dave Winer’s Scripting News is also credited with being one of the oldest and longest running weblogs. Another early blog was Wearable Wireless Webcam, an online shared diary of a person’s personal life combining text, video, and pictures transmitted live from a wearable computer and EyeTap device to a web site in 1994. This practice of semi-automated blogging with live video together with text was referred to as sousveillance, and such journals were also used as evidence in legal matters.

Dr. Glen Barry started publishing the first political blog — the Forest Protection Blog (originally entitled “Gaia’s Forest Conservation Archives”) at http://forests.org/blog/ — in 1993, both to campaign for forest protection and as his Ph.D. project. It began using Gopher in 1993, and has been on the web continuously since Jan. 1995, making it possibly the web’s first blog, and certainly the oldest continuously running web based blog. The work has since evolved into the world’s largest environmental portals.

Early blogs were simply manually-updated components of common Web sites. However, the evolution of tools to facilitate the pr

A blog (a contraction of the term “Web log”) is a Web site, usually maintained by an individual [ with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. “Blog” can also be used as a verb, meaning to maintain or add content to a blog.

Many blogs provide commentary or news on a particular subject; others function as more personal online diaries. A typical blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (artlog), photographs (photoblog), sketches (sketchblog), videos (vlog), music (MP3 blog), audio (podcasting), which are part of a wider network of social media. Micro-blogging is another type of blogging, one which consists of blogs with very short posts. As of December 2007, blog search engine Technorati was tracking more than 112 million blogs. With the advent of video blogging, the word blog has taken on an even looser meaning — that of any bit of media wherein the subject expresses his opinion or simply talks about something.