When the Director of the Central Intelligence Agency can't maintain his privacy, nobody else has a chance.

The only way to win the self-surveillance game -- played by everyone who uses a network-connected computer -- is not to play. That's why U.S. Homeland Security Secretary Janet Napolitano doesn't use email.

David H. Petraeus resigned as head of the CIA, according to reports, because of an FBI inquiry into confrontational emails sent by his biographer and mistress, Paula Broadwell, to Jill Kelly, a friend of Petraeus and a rival in Broadwell's eyes.

[ Do you know how to protect yourself when using free email services? Read Petraeus Fallout: 5 Gmail Security Facts. ]

The FBI's investigation appears to be more the result of Kelly's friendship with an agent than the content of the messages. According to The Daily Beast, the FBI could barely muster a legal justification for opening an investigation. The agency would have to hire a lot more agents if it routinely investigated every email message deemed to be mildly harassing.

Nevertheless, in this course of its investigation, the agency discovered that Petraeus and Broadwell had been communicating covertly, by saving messages as unsent drafts in a single Gmail account, so they could login to the account and read what the other had written.

Petraeus evidently failed to consider the privacy implications of a change Google made to Gmail in 2008. That was when the company began providing Gmail users with the ability to track the IP address used to access accounts as a way to improve online security. As I noted at the time, "The information listed includes the Gmail user's type of access (browser, mobile, POP3), IP address, date and time. Not only will this new feature improve Gmail security, but it's also likely to please law enforcement authorities. In cases where a suspect's Gmail use is an issue, investigators who might otherwise have to request or subpoena log data from Google may only need access to the Gmail account itself."

What's more, now we're learning that the same inquiry -- which is unlikely to result in any criminal charges -- has claimed another victim. On Monday, the Department of Defense said it had been informed that the FBI's investigation had identified issues that affect Gen. John R. Allen, the commander of U.S. and NATO troops in Afghanistan. The Washington Post reports that the FBI found some 20,000 to 30,000 pages of "potentially inappropriate" email messages between Allen and Kelly, the woman who sought the FBI inquiry in the first place.

There are conflicting accounts about whether or not the FBI obtained a warrant for its inquiry.

"This is a surveillance state run amok," writes Glenn Greenwald in The Guardian. "It also highlights how any remnants of Internet anonymity have been all but obliterated by the union between the state and technology companies."

The careers of two of the nation's top military men have unraveled because the FBI started pulling threads from an inbox without any real evidence of a crime. Maybe that's just the wakeup call the government needs to recognize the value of privacy.

If that happens, it won't be the first time. In 1987, Supreme Court nominee Robert Bork's video rental history was revealed by reporter Michael Dolan, who obtained the information from Bork's local Washington, D.C. video store. Dolan justified his actions in part by noting, "[T]he judge indicated during his confirmation hearings that he's not necessarily a rabid fan of the notion of a constitutional guarantee of privacy."

Washington legislators were so shocked that their indiscreet viewing choices might be revealed that they promptly passed the 1988 Video Privacy Protection Act, which would have to wait until the Facebook era to be rendered obsolete by the marketing-surveillance complex's promotion of sharing as a social good.

Now that it's clear government officials stand as naked before online investigators as lowly citizens, maybe we'll see privacy exhumed from its grave, embalmed, and propped up as if it were alive and well again.