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Hacker News
Google launches two-factor authentication
http://www.mattcutts.com/blog/google-two-step-verification/
6 comments
10/2/2011
Reddit
Google launches support for Security Key, a simpler kind of two-factor authentication
http://www.theverge.com/2014/10/21/7027267/google-launches-support-for-security-key-a-simpler-kind-of-two-factor
2 comments
22/10/2014
privacy