There are many types of blogs. Mostly a blog is our safety valve for ranting against the government. Blogging is free of charge. Any one can have one or several blogs. Some blogs are more social than others. They have contact lists or links, recipes, hobbies, DIY, interesting articles, photos, videos, music, stuff for sale, comment boxes, gadgets, forums etc. The list is endless. I even blogged about blogging! There is no hard and fast rules. You do what you like with your own blog. Choose any template and fill it up with posts or gadgets.
Please hover your mouse over my ID to read my blogs (I have 53)
some reasons: http://www.google.com/support/forum/p/blogger/thread?tid=2dc799e3e43cc352&hl=en