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Social Networks Leak Personal Information

InformationWeek, By Thomas Claburn — Internet users are revealing information that identifies them through the use of social networking sites, a research study claims.

Online social networking sites leak personal information, a new study has found, raising the possibility that users of such sites can be tracked everywhere they go online.

The study, “On the Leakage of Personally Identifiable Information Via Online Social Networks,” was co-authored by Balachander Krishnamurthy, a researcher at AT&T (NYSE: T) Labs and Craig E. Wills, a professor of computer science at the Worcester Polytechnic Institute in Massachusetts, and presented last week at the Second ACM SIGCOMM Workshop on Online Social Networks in Barcelona, Spain.

The researchers say that social networks leak information through a combination of HTTP header information — the Referer header and the Request-URI — and cookies sent to third-party aggregators such as Google (NSDQ: GOOG)’s DoubleClick, Google Analytics, and Omniture, among others.

As a consequence of this leakage, third-party aggregators can potentially link social network identifiers to past and future Web site visits, thereby identifying a person and his or her online activities.

“The ability to link information across traversals on the Internet coupled with the wide range of daily actions performed by hundreds of millions of user on the Internet raises privacy issues, particularly to the extent users may not understand the consequences of having their PII [personally identifiable information] available to aggregators,” the study states.

The study notes that while the privacy policies of the third-party aggregators typically declare the sharing of non-indentifying information, they don’t make it clear that an identity can often be derived from supposedly non-identifying information.

“What we are clearly trying to establish with this work is that these third party companies are receiving information about us from online social networks,” said Wills in a phone interview. “When you or I create an account on an online social network, there’s a unique identifier that’s always associated with your account. That account number is being passed along to these third party aggregators. And along with the cookies these aggregators are already maintaining, they now can link that cookie to a social network identifier.”

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