Really good tutorial I like the way that you presented your information. Easy to read and easy to understand. Did you ever think of including how social engineering differs when it comes to the opposite sex ?

For example I think that it is much easier for a girl to talk a password out of a guy. Your probably asking why? Well because just about every guys weakness is sex. Once a girl starts talking about it to a guy eventually he'll break and end up giving info.

Now on the other hand girls are harder to convince. Girls just seem to make things impossible at times. As to why I am still not sure though.

But overall nice post.