Unfriend Yourself, a book about the implications of social media use and how it has changed us and our communication. It was a book that challenged readers to go three days without social media to reflect on how it affects our lives, especially through our relationships with others.
I've just come across this interview with the author, so it might be worth a read if you're interested in it at all. He reiterates some of the important messages of his book, namely how some people use social media to replace face-to-face conversation.
The Blessings and Curses of Social Media: An Interview with Unfriend Yourself Author Kyle Tennant