I have noticed that many people don’t know what a blog is, so I would like to talk about that briefly.
A blog is a type of website or part of a website. Blogs are usually maintained by an individual with regular entries. (…) Entries are commonly displayed in reverse-chronological order. Blog can also be used as a verb, meaning to maintain or add content to a blog. Source: Wikipedia
A blog is a website. A blog has many entries or posts. To write a post means to update your existing blog with a new article. To create or write a new blog means to start a new website.
Please, don’t say that you are going write a blog when you mean you will write a post. That would be wrong. OK?