I have just flipped through the open windows on my laptop and come to this helpful piece:

Blogs exist right on this border between what’s private and what’s
public, and often we see that they disappear deep into the private
sphere and reveal far too much information about the writer. When a
blog is good, it contains a tension between the two spheres, as delicate
a balancing act as the conversation of any experienced guest of
the French salons of the 19th century.

from page 8 in here.
(This links to the piece I posted a few minutes ago - look on the post below.)
It takes on the notion of the public private tension being more nuanced on a blog and mentions the comparison with face to face interaction.
And this here is so helpful too:

In some manner, the
writer is putting his or her daily experiences into a larger context, discussing
micro events in relation to the wider universe of events. The
weblog connects the public arena with that of individuals.

(Page 10)

This notion, that Turkle also writes about, in relation to online gaming of ‘writing oneself’, is highy pertinent I think. Here is Turkle on the topic:

‘as they participate they become authors not only of text but of themselves, constructing new selves through social interaction’, (1995:10)

Gorgeous.
I have used this in relation to online teen interation - on their message boards and their home pages etc.