Blogs are usually (but not always) written by one person and are updated pretty regularly. Blogs are often (but not always) written on a particular topic – there are blogs on virtually any topic you can think of. From photography, to spirituality, to recipes, to personal diaries to hobbies – blogging has as many applications and varieties as you can imagine.
http://www.blogger.com/post-create.g?blogID=8549818541743197094
