A blog is an online diary kept by a person or a group. A blog usually
is in reverse chronological order, an can be updated every minute or
once per month. The first blog was launched in 1997. In July 2005,
there were 14 million blogs worldwide, with 80,000 new blogs per day.
Technorati, the first blog search engine, gave the number of 65 million
blogs in December 2006, with 175,000 new blogs per day. Some blogs are
devoted to photos (photoblogs), music (audioblogs or podcasts), and
videos (vlogs or videoblogs).