There are many factors to consider when determining if a blog is a blogging site. Generally, a blog is a platform for sharing thoughts, ideas, and experiences online. This means that the content on the blog must be original, and can be written in any format (text, images, videos).
Furthermore, most blogs require visitors to sign up for an account before they can view the content. This indicates that the blog is designed to be used as a personal online journal.
As a result of these criteria, it is safe to say that most blogs are considered blogging sites. However, not all blogs are created equal. Some blogs are primarily designed to share content (rather than create it), and do not require an account to view. Conversely, some blogs are primarily designed as platforms for advertising and marketing purposes.
In this case, an account is necessary to access the full range of features available on the site. Ultimately, it is important to consult with the blog owner to determine if their blog is classified as a blogging site or not.