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.