Two related pieces on the way blogging affects our understanding of public vs private life. The first is Warren St. John's NY Times piece, Dating a Blogger, Reading All About It

After coming in for some sporting abuse from a friend who told him blogging was a waste of time, Mr. Bruner wrote in his blog that the friend "was fat and runs like a girl," adding that he was sure the friend would not be offended "because he doesn't read blogs." With a push of a button, the comment was published on Mr. Bruner's site, www.bruner.net/blog, and accessible to anyone with a computer.

A few days later, though, that friend's curiosity about blogs was awakened after all.

The other is Social Software as Public Enemy at iSociety:

This sort of explains why the 'network society' or the 'information age' generates so much concern about privacy. Information networks cut across all sorts of boundaries, mingling politics, social lives, working lives, sex lives and so on. They don't care. Data bases and networks don't form judgements about what should or shouldn't be stored, so we have to take that decision for them [...]