future biography

I have just been reading a biog of Jane Austen. (I finished it! wonders will never cease) I was thinking - how are biographers going to cope these days when we don't write letters - Austen wrote multitudes of long letters to lots of people - we therefore often can construct where she was , what she was doing and thinking at any time. Then I realised - well its not the same - but the blog may fill part of the hole left by the abandon of epistolary culture. In which case, at this point my biog is looking sadly lacklustre.