This technique is very old. The main using was in politic, where politic sides need know pre-voting preferencs. Main idea was leave/lost letters on train station, schools, bus stationts ets. Text was very short and say only: "If you are interest in this politic side, please send it back". Based on t...
Where can you be attacked by social engineering? Do you know where you can
meet social engineer and what are typical examples from live? General methods
are internet (pharming or fakes logins), email (phishing), telephone (fake identity) and in real live.
Say about you only what is necessarily.
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One way of social engineering is guessing password based on knowledge of
the person. The all studies speak about more people who have password as
driver licence, name of their pets etc. In this time is guessing password
based on know person and psychology. But what about the long future?