The types of blogs you can build are limited only by your imagination and by your willingness to conduct research. For instance, while some bloggers focus on general topics, such as cars, other bloggers narrow the scope of their blogs even further to sub-topics, such as luxury cars or antique cars. From an optimization standpoint, a blog with a narrower scope would likely outperform a blog with a broader scope in terms of conversions or clicks-per-visitor. So, if your goal is to make money, the types of blogs you can build are somewhat limited.

In terms of actual topics for the types of blogs you can build, there are about 9 major areas that are popular for current blogs: business, culture, community, politics, religion, science, travel, online diaries, and gossip. Most blog directories use similar topical categories to order blogs.

In addition to the topic for the types of blogs you can build, you will also want to consider the program used to generate it. This is another way that directories categorize blogs. For instance, blogs can fall under the category of the tool or software that was used to create them. Some blogs are created using Google's Blogger. These blogs are often lumped together in directories as the same "type" of blog. They actually have an auto-surfing system that allows you to jump randomly from one Blogger blog to the another.

Other types of blogs you can build include social networking blogs, which allow members of the same network to interact with each other using various blog functions. Two examples are Livejournal--which was one of the original social networking blog systems--and Myspace, which is currently the largest, boasting a base of around 80,000,000 users. In recent months, marketers and business persons have begun using Myspace to introduce their product to potential customers.

Another type of blog you can build is a video blog or "vlog." These usually contain videos and allow other posts to attach media in comments.

The last types of blogs you can build are geographical blogs. With such a robust blogging atmosphere--with users weighing in from all over the globe--directories, such as Blog Wise will allow users to search for blogs by geographic location. If you believe you have some information you can contribute about your specific region, you may want to start a regional geographic blog.