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Data we voluntarily provide online — such as on dating websites — may not stay with that site. While not always obvious, websites commonly allow other companies to track user behavior.

NPR and the Center for Investigative Reporting are documenting just how vivid the typical person's digital picture has become — and how easy it can be for others to see it.

The National Security Agency's effort to find connections between suspects has led the agency to collate reams of phone and e-mail data with information from sources that include GPS data and Facebook, according to The New York Times. The newspaper cites documents provided by former NSA contract worker Edward Snowden.

Passwords are a pain to remember, and they're only partially effective in securing your devices. Now, with a fingerprint scanner built into the new iPhone 5s' home button, biometrics is taking a big step into a much bigger ecosystem. But such scanners raise security and privacy concerns of their own.

Joining other browers and social media sites, Yahoo issues a "transparency report" about the number of requests it gets for users data.

The U.S. spy agency breaks codes but also lobbies private IT companies to leave backdoors into their products. The revelations are the latest from documents leaked by former NSA contractor Edward Snowden.

The NSA says it's only examining traffic information, not the content of Americans' phone calls. How much can that information tell you? Quite a lot, and in some ways it's more useful than actual content. NPR's Larry Abramson learns what analysts can discover about his life and contacts just by looking at his Gmail account.

The website Groklaw, which for 10 years demystified complex issues involving technology and the law, is shutting down. Editor Pamela Jones writes that she can't run the site without email, and that since emails' privacy can't be guaranteed, she can no longer do the site's work.

NSA leaker Edward Snowden's revelations have left us all grappling with questions of privacy. One way to keep some of our information private is through email encryption. But, how does that work?

An internal audit of the spy agency turned up many cases of "unauthorized surveillance of Americans or foreign intelligence targets in the United States," The Washington Post reports. Documents supplied by "NSA leaker" Edward Snowden add new details to the scope of U.S. surveillance programs.