If a blog has frequent new postings, and enables reader comments, then, the blog is not a journal or diary. A blog is not a memoir or textbook. A blog is not a bull horn, intercom, or preaching pulpit.
A blog is:
NOT a "journal/diary": what diarist lets other people write in it, and what journal is entered in chronological order, but is displayed paradoxically and unexplainably, in Reverse chron order?
What print journal links directly to other journals?
What paper diary writing appartus requires fingers to simply touch the letter producing keys, and not have to guide them, as in penmanship?
What book or biography can be opened to any random page, and certainly be interesting, understandable, and context-free?