4.0

I really liked this and would recommend it to a lot of people. Most of it is somewhat common knowledge but it's always helpful to have it in one place. It's reassuring to know that people generally do like each other and think pretty favorably toward one another.
However on the flip side, in later chapters the author also states that when listing friends, a lot of YOUR friends wouldn't consider you THEIR friend. That's a little disheartening.
So- part of this book is pretty hopeful and part is a little depressing.
It's important not to give up hope of finding/ making/ keeping friends at any age.