For English I've been reading, well, back issues, of Samuel Johnson's The Idler [1758-60]. It reads like a blog. Just a twice-weekly publication of Johnson's current ideas. One issue was entirely about a visit with his friend William Marvel. Another was a sermon on the evils of colonization in Canada.
I don't think the "narcissism" of publishing on one's own life and thoughts is as modern as some people like to claim.