A blog (a contraction of the words web log) is a discussion or
informational site published on the World Wide Web and
consisting of discrete entries ("posts") typically displayed in
reverse chronological order (the most recent post appears
first). Until 2009 blogs were usually the work of a single
individual, occasionally of a small group, and often covered a
single subject. More recently "multi-author blogs" (MABs) have
developed, with posts written by large numbers of authors and
professionally edited. MABs from newspapers, other media
outlets, universities, think tanks, interest groups and similar
institutions account for an increasing quantity of blog traffic.
The rise of Twitter and other "microblogging" systems helps
integrate MABs and single-author blogs into societal newstreams.
Blog can also be used as a verb, meaning to maintain or add
content to a blog. The emergence and growth of blogs in the late
1990s coincided with the advent of web publishing tools that
facilitated the posting of content by no