- https://www.eff.org/join
- https://my.fsf.org/donate
- https://www.torproject.org/donate/donate.html.en
- http://twitter.com/learncrypto
- https://twitter.com/EFF
- https://www.facebook.com/Learn-Cryptography-358132750970437
- https://twitter.com/learncrypto
- https://plus.google.com/+Learncryptography
- https://learncrypto.tumblr.com
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