There is no definitive answer to this question as it depends on the blog’s privacy settings and the internet browser used by the individual. In most cases, however, it is possible for anyone to view a blog.
Some blog owners may choose to make their content available only to registered users of their website or service, while others may allow anyone with a web browser to view their content. Some bloggers may even choose to make their content publicly available on the internet for anyone to access.
The decision whether or not to make a blog available to the public is ultimately up to the individual blogger. However, it is generally safe to assume that any blog can be viewed by anyone with access to the internet.