On authentication usability
A few days ago, I tried to log into my alternate Facebook account, one I hadn't logged into for a while. After the first or second failed attempt at logging in (I couldn't remember the password), my mail client rang and I saw the following email from Facebook:

This struck me as a fantastic touch and a great usability boost. It also made me think about the usual login flow in sites, and I realized that email is, in my opinion, being underutilized in the login process. There ...
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