How to spot a lie? (TED)

Here is a very interesting speech by Pamela Meyer about lying.
You can use it to generate discussion about the following quotes from the video:
1) Do you agree that we live in a "post-truth" society? What does it mean?
2) "Everybody is willing to give you something. They're ready to give you something for whatever it is, they're hungry for" and "if you don't want to be deceived, know what you're hungry for". 
Ask your Sts: "What are YOU hungry for?"
3) Why do people need "white lies"?

You can also concentrate on different issues from the video.