FaceCloak lets users hide sensitive updates from prying eyes

Social networks are rife with examples of users failing to understand the privacy implications of posting sensitive information online.

In February, for example, school officials in Wisconsin suspended a teacher who posted on Facebook a picture of herself pointing a gun at the camera. In April, the Swiss insurance company Nationale Suisse fired an employee after she called in sick and then posted updates on the same site. Others have raised concerns about users handing so much personal information to social-networking companies themselves.

Now, researchers at the University of Waterloo in Ontario have developed a browser plug-in to help users keep their information private from prying eyes and from social-network providers as well. Urs Hengartner, an assistant professor of computer science, and his colleagues say the plug-in replaces sensitive information in a user's profile and news feed with meaningless text that can only be unscrambled by trusted friends or contacts. Dubbed FaceCloak, the tool assures its users that sensitive data stays private, Hengartner says. "If you have a particular illness, you might want to allow only your friends to see that," he says. "This leaves it up to the user to decide what information to keep away from Facebook."