Ok ok, one other thing that has dawned on me: it’s not just the emergent connections between writers that is salient when clustering. It’s the connections between readers as well!
In this way, I think blogs are a whole lot like essays:
Of all forms of literature, however, the essay is the one which least calls for the use of long words. The principle which controls it is simply that it should give pleasure; the desire which impels us when we take it from the shelf is simply to receive pleasure. Everything in an essay must be subdued to that end. It should lay us under a spell with its first word, and we should only wake, refreshed, with its last.
-- Virginia Woolf, The modern essay