Social media has a way of changing your mood. I can see a picture of my ex, and it ruins my day.

If I'm a secure person, my online persona is going to be pretty similar to the person that I am. If I'm insecure, my online persona is probably very different from who I am in real life.

If I post a selfie, and you like it, it's of little cost to you, but it feels great to me. That becomes addictive, and you see people's narcissism so quickly. I think that's a very dangerous thing for us all to be addicted to.

It becomes very difficult for us to adjust to a world without social media because we spend so much time involved with it.

One of the things that makes a social-media cleanse so difficult is that every time we log on, every notification we get is an addictive substance. It's just like any drug.

It's funny: I spend time in the book criticizing social media, but I'm also aware that a lot of my success is because of social media. I can broadcast myself and my work to thousands of people that are following me or my friends. I do think that social media can be good for self-promotion.

I'm not a fan of the selfie. I think it's at the heart of the narcissism that social media brings into our lives.