We get one of these little pings on our smartphones, and we get a little hit of dopamine as well. We get excited. We feel anticipation. As we feel this, we want it more and more. So we spend more and more time looking at our phones.

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.

We miss extra bits of knowledge that can add value to our lives. We sort of lack empathy because we're multitasking all the time.

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.

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.

We get one of these little pings on our smartphones, and we get a little hit of dopamine as well. We get excited. We feel anticipation. As we feel this, we want it more and more. So we spend more and more time looking at our phones.

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.