An example of how privacy laws have not kept up with technology

Did you know:

Gender, ZIP code, and birth date feel anonymous, but Prof. Sweeney was able to identify Governor Weld through them for two reasons. First, each of these facts about an individual (or other kinds of facts we might not usually think of as identifying) independently narrows down the population, so much so that the combination of (gender, ZIP code, birthdate) was unique for about 87% of the U.S. population. If you live in the United States, there's an 87% chance that you don't share all three of these attributes with any other U.S. resident.

And:

But research by Prof. Sweeney and other experts has demonstrated that surprisingly many facts, including those that seem quite innocuous, neutral, or "common", could potentially identify an individual. Privacy law, mainly clinging to a traditional intuitive notion of identifiability, has largely not kept up with the technical reality.

Read entire Technical Analysis at EFF.org.
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