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. (Wikipedia)
Weblogs typically describe a personal diary, kept on the Web, which can be edited by an end-user with few web publication skills. (Kwai Fun IP & Wagner)
A frequently updated web site consisting of personal observations, excerpts from other sources, etc., typically run by a single person, and usually with hyperlinks to other sites; an online journal or diary.(Oxford English Dictionary)
This was the original use of blogs. Anybody with a point of view could freely express their opinions and get feedback.
The Newbrowne Blog , Xbox 4 Nappy Rash , Lowering my cholesterol
All due to individual’s enthusiasm. Can be for any topic. Bloggers are not concerned by number of readers. Its all down to the bloggers enthusiasm. Blogs can come and go very quickly. Who’s going to read it and why?
These can be used by companies for internal communication or as a communication channel with the external public.
Internal blogs promote open communication between staff, encourage participation, break down the hierarchy, and help create a sense of community.
External corporate blogs are more casual than traditional forms of company release but still are trying to do the same job. They can be viewed as more informal and can at times offer a more honest and direct view than traditional communication channels. Nevertheless, they remain public relations tools.
When blogs started out people tried to keep track of blogs by using directories, such as Eatonweb . These were manually updated by enthusiasts. Growth of the Blogosphere meant that limits were quickly reached.
Today there is no single search engine for the blogosphere. Examples include Technorati , Google Blog Search
The now familiar blog continues, but we are now beginning to see new variations
Microblogging users to write brief text updates (usually 140 characters).These messages can be submitted by a variety of means, including text messaging, instant messaging, email, MP3 or the web. Twitter or Tumblr
Lifestreaming is an online record of a person's daily activities, either via direct video feed or via aggregating the person's online content such as blog posts, social network updates, and online photos. Soup