I guess Plato advocated something called hypomnemata, which, based on what I could figure out on wikipedia and other places, was a sort of personal journal of philosophical reflections on whatever topics one might run across. It sort of sounds like a very low-tech blog. A journal, or introspective philosophical diary. And one little thing I saw (I didn't keep track of where) mentioned the idea that in 500BC or whatever Plato's epoch was, this idea of personal journal-keeping was radically disruptive technology. It was, on the one hand, an acknowledgement of the imperfection of human memory, over time, and on the other, a sort of solution to it. I find the idea that journal-keeping is a disruptive technology a compelling one.