A friend just drew my attention to an element in The Ellen Show some time ago in which Ellen shows Facebook pictures of people in her audience:

This is a great illustration of what Beata Staszynska and I have been discovering over and over: people feel that social media are a private environment in which they share information only with an audience of their choice. When they then are confronted with their choices in a different audience setting embarrassment follows.
On this principle a few elements of the Dynamic Identity workshop are based. The Ellen Show material will be added to these for sure.