EFF has run a valuable campaign on the risks of leaking metadata to third parties. If you upload a photo to a public website, for instance, the file might contain information on exactly when and where you took the picture. A stalker can make use of the information, especially if you upload photographs wherever you go. If you make a phone call or text message, the associated metadata may get less privacy protection than the what you said or typed. The US government has claimed that warrantless searches of communication metadata, which might identify the sender, receiver, and time of a message, are OK. Unfortunately, this has led some people to think that metadata themselves (I’m standing by “data” as a plural) are evil.
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