The word "blog" is short for “weblog.” Weblogs began in the mid-90s as a way for individuals to keep online diaries, or journals, of their activities. The popular site Xanga listed only 100 blogs in 1997, but boasted more than 20 million blogs in 2005.
Most search engines now offer an option to search blogs, and many individuals choose to get their news and information from blogs. The good news about blogs is that they are generally an unfiltered information source managed wholly by the blog owner. The bad news is that the information on any blog is only as good as that blog's editor.
Blogs have had significant impact on political campaigns, news gathering and have allowed individuals to share information with the world easily and informally.