Conduct your own social engineering experiments.
While at a restaurant, convenience store, bank, place of business, or any shopping location, ask you waiter or waitress, bartender, server, sales clerk, or cashier personal questions about their family or their interests. How much information are you able to obtain about this person you do not know?
Name, address, age, religion, political beliefs, place of birth, pets, hobbies, number of children, type of car they drive, or any other information you think you can obtain.
Write your findings in either a list or in paragraph form.