A blog -- short for weblog -- is:
An online column, where each piece of writing -- called a post --
appears in sequence, with the newest one first.
"...the first journalistic model that actually
harnesses rather than merely exploits the true democratic nature of the web.
It's a new medium finally finding a unique voice."--Andrew Sullivan
"[a] collection of posts...short, informal, sometimes
controversial, and sometimes deeply personal...with the freshest information
at the top."--Meg Hourihan