The answer to this question is both yes and no. A blog is primarily a written medium, while a social network is primarily an online platform for social interaction.
However, many blogs incorporate features that make them resemble social networks, such as the ability to create user profiles, post updates, and share links. So, in some ways, a blog can be considered a social network.
On the other hand, blogs are not designed for mass collaboration. Users are typically limited to posting content by themselves, and there is no built-in mechanism for sharing or linking content with other users.
So, while a blog can function as a social network, it is not necessarily a social networking platform in the same way that Facebook or Twitter are.