Jeremy Crampton's Foucauldian study of cyberspace is very good. I'll post some notes shortly - first, a quick observation to mention his nice use of hupomnemata as a blog analog.
[It] consisted of notebooks or aide-memoires in which one could write down examples and relfections, in order to work on the self, and to produce the truth about oneself... In other words, by writing down things learned, one can create a "treasure" constituting "reminders" which one might need to call upon when one's memory is weak... (91-92)
Sounds a bit familiar. He goes on to contrast that with confessional writing - very interesting.
Crampton cleverly notes Plato's mention of this - in the Phaedrus, that classic early text of media criticism (and technophobia, in some readings).