Technology

Basically it goes like this -

Imagine a stranger is standing over your shoulder with a notepad and a camera. Every couple seconds, he takes a photo of what you're doing and writes down everything you've typed. Then, the man hands that information off to another person. When you ask what that person is going to do with the info, the stranger assures you that he's a friend and your information is perfectly safe.

You don't know what it's being used for, and you can't be certain that the second stranger will actually keep your information safe. What if he just tosses it into an unlocked file cabinet? Anyone can now just come along and grab your information. That could be something as simple as something you looked at on Facebook. Or, it could contain your banking login. You can't be certain what they're taking notes and photos of, and what they or the strangers they supposedly trust are going to do with your information...

So basically just explaining what Recall and data selling are using metaphor combined with a not insignificant amount of fear mongering. The best way I've found to explain 99% of computer concepts to lay people is to avoid mentioning a computer as much as possible. This varies depending on the age of the person, but most of the time I'm cleaning or setting up computers and laptops, I'm doing it for someone 50+