A proliferation of services that let social networkers share their locations have some concerned about the privacy ramifications. Facebook and Twitter will soon offer location-based features, and dozens of similar services already exist, the Wall Street Journal reports. "There are a lot of concerns about the government being able to subpoena this information," says Carnegie Mellon University researcher Lorrie Cranor, citing other potential and possibly unwelcome uses of such information. Cranor was involved in a recent Carnegie Mellon study of 80 location services that found the majority either don't have a privacy policy or collect and save all data for an indefinite amount of time, according to the WSJ report. (Registration may be required to access story.)
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