Is Anything Private

The Poynter Institute's e-media tidbits highlighted a problem I've been considering a lot lately: in the digital age, is any communication private anymore?
Poynter points to a recent case involving an e-mail exchange between a reporter and reader, which the latter then posted to her blog without informing the reporter or providing context.
Last spring, I spoke with an editor who was mortified when what appeared to be a private conversation about an ethical lapse ended up racing around some blogs like a forest fire (a reader rep had said in private that an incident was a "f***ing trainwreck" ... you can imagine how dismayed she was when her colleagues saw that characterization in print).
You can circulate what I say in lecture, copy and paste parts of my e-mails, visit me in office hours and blog about my comments, all largely without context. The Web has the power to convert private exchanges into public stories.
When everyone can be a publisher, is anything private? What does this mean for us as a society? Is it helpful, e.g. does it strip away layers of secrecy that cloak problems? Does it hurt us, e.g. make us less open to conversation and deliberation?