'Blog' and 'Blog Post'

I note that there are still people who confuse 'blog' with 'blog post.'  'Blog' is elliptical for 'weblog.'   They are interchangeable terms.  Presumably, no one will refer to weblog entry as a weblog.  It makes as little sense to refer to a blog entry as a blog.   

A blog is composed of blog posts.  It is not itself a blog post, nor is a blog post a blog.  Roughly, a blog is to its posts as a book to its chapters.  Since you wouldn't refer to a chapter of a book  as a book, you shouldn't refer to a post on a blog as a blog.

Every weblog is a website, but not every website is a weblog. A weblog is a regularly updated website consisting mainly of relatively short entries called 'posts' which are arranged in reverse chronological order.  That's the essence of it.  Hyperlinkage and comments I would not build into the definition, nor would I require daily updating. You are free to differ.  I admit, though, that comments -- assuming you can attract people capable of making good ones -- and hyperlinks add considerably to a blog's interest.  As a general rule, if you are quoting from a source that is available online, you ought to link to it.