From a recent critical piece in The New Yorker:
In a diary, the trivial and inconsequential — the “woke up, got out of bed, dragged a comb across my head” pieces — are not trivial and inconsequential at all; they are defining features of the genre. If it doesn’t contain a lot of dross, it’s not a diary. It’s something else — a journal, or a writer’s notebook, or a blog (blather is not the same as dross).
Interesting hair-splitting; but true, I suppose. Funny how much more serious dross sounds than blather, though.