Hack Like a Pro: The Ultimate Social Engineering Hack « Null Byte

Social engineering is the art of getting people to give you the information you are seeking, rather than breaking into a system to get it. Among the most sought after bits of information is the username and password. Many online systems—even financial websites—use your email address as a username. Then they ask you to provide a unique password.

via Hack Like a Pro: The Ultimate Social Engineering Hack « Null Byte.