A blog (a contraction of the term weblog) is a type of website, usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. 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.
Clearly a blog (noun) is a website, or the collection of postings, notes, rants, pictures of your kittens, or whatever.
Or, to blog (verb) or blogging represents the act of writing entries to your web_log.
Somewhere along the way, it became popular to refer to an individual post on a blog as “a blog” in and of itself. This would be like referring to each individual entry in your journal as your journal.
Does anybody else see the confusion?