network privacy?

On Digital Privacy
Until a few years ago, it was legal to photograph someone underneath their clothing (if they were in a public setting). this left pervs in the legal clear to go snap-happy under stadium seating. fortunately, a judge set a legal precedent- declaring the space 'underneath a person's clothing' as personal space, regardless of location, and subject to privacy.

anyway, i ponder- do we have intrinsic right to privacy on the things we write, or are they considered public since the networks used are public?

is this comment legally mine, yours, or blogger's? XD

also...
should we be upset that the government data mines all networks both public and private?