A driver uses a cell phone while behind the wheel in Evanston, Ill. | Alex Garcia/Chicago Tribune/MCT

By Lindsay Wise and Jonathan S. Landay | McClatchy Washington Bureau

If you tweet a picture from your living room using your smartphone, you’re sharing far more than your new hairdo or the color of the wallpaper. You’re potentially revealing the exact coordinates of your house to anyone on the Internet.

The GPS location information embedded in a digital photo is an example of so-called metadata, a once-obscure technical term that’s become one of Washington’s hottest new buzzwords.

The word first sprang from the lips of pundits and politicians earlier this month, after reports disclosed that the government has been secretly accessing the telephone metadata of Verizon customers, as well as online videos, emails, photos and other data collected by nine Internet companies. President Barack Obama hastened to reassure Americans that “nobody is listening to your phone calls,” while other government officials likened the collection of metadata to reading information on the outside of an envelope, which doesn’t require a warrant.

But privacy experts warn that to those who know how to mine it, metadata discloses much more about us and our daily lives than the content of our communications.

So what is metadata? Simply put, it’s data about data. An early example is the Dewey Decimal System card catalogs that libraries use to organize books by title, author, genre and other information. In the digital age, metadata is coded into our electronic transmissions.

“Metadata is information about what communications you send and receive, who you talk to, where you are when you talk to them, the lengths of your conversations, what kind of device you were using and potentially other information, like the subject line of your emails,” said Peter Eckersley, the technology projects director at the Electronic Frontier Foundation, a digital civil liberties group.

Powerful computer algorithms can analyze the metadata to expose patterns and to profile individuals and their associates, Eckersley said.

“Metadata is the perfect place to start if you want to troll through millions of people’s communications to find patterns and to single out smaller groups for closer scrutiny,” he said. “It will tell you which groups of people go to political meetings together, which groups of people go to church together, which groups of people go to nightclubs together or sleep with each other.”

Metadata records of search terms and webpage visits also can reveal a log of your thoughts by documenting what you’ve been reading and researching, Eckersley said.

“That’s certainly enough to know if you’re pregnant or not, what diseases you have, whether you’re looking for a new job, whether you’re trying to figure out if the NSA is watching you or not,” he said, referring to the National Security Agency. Such information provides “a deeply intimate window into a person’s psyche,” he added.

The more Americans rely on their smartphones and the Internet, the more metadata is generated

Metadata with GPS locations, for example, can trace a teenage girl to an abortion clinic or a patient to a psychiatrist’s office, said Karen Reilly, the development director for The Tor Project, a U.S.-based nonprofit that produces technology to provide online anonymity and circumvent censorship.

Metadata can even identify a likely gun owner, she said.

“Never mind background checks, if you bring your cellphone to the gun range you probably have a gun,” Reilly said.

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This is a new feature. Why on earth would they QUIETLY add geolocation metadata to the file headers of images or video, EXCEPT solely for the government to spy on us. I've parsed images bit by bit many times, but not in the last 10 years. I would guess this is another fantastic new feature from Patriot Act.

This is one of the biggest security breaches in the 21st century. So many millions are exposed. I can't even fathom how fucking retarded these people are, who develop and deploy this shit. Its like mass producing a skeleton key that opens everyones backdoor.

I mean fucking think for 1 second here. Some random teenage girl has a photo online with her address attached to it, but she didn't put the address there, she just created a facebook profile like everyone else does. Or some person writes something on line that some psycho reads and dislikes and now that psycho has that persons address.

This is very bad, very bad on so many levels.

Damage is already done too, we just haven't seen the consequences yet. We could mitigate the damage by closing the security breech and preventing further damage, but they aint gonna do that now are they

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