Blogs have become so common and are now read at such great rates that it’s difficult to find exact numbers to how widely distributed blogs are.
Each blog has its own objective. They're run by all sorts of people from individuals to companies. Blogs can cover pretty much any topic you can think of which all fall into some kind of category.
Corporate blogs are written by a business for its customers, they are usually found on the company’s website.
Personal or diary blogs are written about that person, what they’ve done, what they plan to do which targets friends and family usually. Professional blogs are usually written to make profit, they are there to try and generate sales. Community or communal blogs are there to share news in a particular geographic location, in a town or a village.
With a bit or research you can answer all these questions and create the best blog for your customers.