in it most simplistic variant its a single persons journal posted to a website. however the range all the way to corporate sites about new products to several people writingnews to many people writing many things.
livejournal.com, blogger.com, slashdot.com. my weblog entry for the day was about how blog has sprung up in use with online journals because people were getting them confused with server logs.
A Snotty-nosed Homosxual - usually called Samsupernova - who lurks on interactive messageboards, snottily disparaging those who have a political persuasion that is other than wish-washy liberal