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The term "blog" is the short form of "weblog". "blog" is used as both a noun and verb. "to blog," meaning "to edit one's weblog or to post to one's weblog". The term "blogger" also came up leading to the popularization of the terms.

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.  The 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.

Early blogs were simply manually updated components of common Web sites. However, the evolution of tools to facilitate the production and maintenance of Web articles posted in reverse chronological order made the publishing process feasible to a much larger, less technical, population. Ultimately, this resulted in the distinct class of online publishing that produces blogs we recognize today. For instance, the use of some sort of browser-based software is now a typical aspect of "blogging". Blogs can be hosted by dedicated blog hosting services, or they can be run using blog software, or on regular web hosting services.

Blogging can sometimes have unforeseen consequences in politically sensitive areas. Blogs are much harder to control than broadcast or even print media. As a result, totalitarian and authoritarian regimes often seek to suppress blogs and/or to punish those who maintain them.

One consequence of blogging is the possibility of attacks or threats against the blogger, sometimes also without apparent reason.

Scientists have long known the therapeutic benefits of writing about personal experiences. Blogs provide another convenient avenue for writing about personal experiences. Research shows that it improves memory and sleep, boosts immune cell activity and reduces viral load in AIDS patients and even speeds healing after surgery.