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Alex Rivera
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For a web application, which is the better option? Usernames has to rely on an email for the person to recall later. Conversely, it's rare for a user to use multiple usernames for a particular web application. Also, sending details back to the user's email gives a certain level of security. Email on the other hand has additional related problems - Most users have multiple email ids and invariably multiple accounts get created. Merging those accounts become a huge headache. Conversely, using an email as a login identifier has the advantage of external authentication via OpenID. What would you suggest?
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