Blog is a new word for an ancient concept, and even an old concept on the Internet and later the Web, though I suppose, by definition, "blog" pertains only to the web so maybe instances that predate Mosaic are DQ'd.
That said, my favorite proto-blog is the Hwy 17 Page of Shame, from 1995-96. 2 guys documenting their daily commute over the hill with an Apple QuickTake camera.