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At a New York state elementary school, teachers can use a behavior-monitoring app to compile information on which children have positive attitudes and which act out. In Georgia, some high school cafeterias are using a biometric identification system to let students pay for lunch by scanning the palms of their hands at the checkout line.

Fairly easy to read argument from a crypto expert (Columbia University computer scientist Steven Bellovin) on the dangers of "back doors" in computer systems.

Try to avoid opening emails from senders you don't 100% trust and know. Also, routinely check your PC using some kind of antivirus or data scrubbing software to ensure your system hasn't accrued keyloggers or malware that might give bad actors sensitive personal information.

It is important to consider whether Snowden is our enemy or our friend. Disobeying the rule of law and throwing turmoil into our system is harmful, but many still view him as a friend of the people.