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A malicious site can find out what social-networking groups you belong to–and then figure out your identity.
Users can share information, but the network only sees encrypted data.
A cryptographic method could see cloud services work with sensitive data without ever decrypting it.
Making more user information public has both privacy and security dangers, experts warn.
Microsoft’s Danah Boyd on social networking.
Researchers hijack Google’s personalized search suggestions to reconstruct users’ search histories.