Read Contagious: Why Things Catch On for Free Online

This desire to share our thoughts, opinions, and experiences is one reason social media and online social networks have become so popular. People blog about their preferences, post Facebook status updates about what they ate for lunch, and tweet about why they hate the current government. As many observers have commented, today’s social-network-addicted people can’t seem to stop sharing—what they think, like, and want—with everyone, all the time.
    Indeed, research finds that more than40 percent of what people talk about is their personal experiences or personal relationships. Similarly, aroundhalf of tweets are “me” focused, covering what people are doing now or something that has happened to them. Why do people talk so much about their own attitudes and experiences?
    It’s more than just vanity; we’re actually wired to find it pleasurable. Harvard neuroscientistsJason Mitchell and Diana Tamir found that disclosing information about the self is intrinsicallyrewarding. In one study, Mitchell and Tamir hooked subjects up to brain scanners and asked them to share either their own opinions and attitudes (“I like snowboarding”) or the opinions and attitudes of another person (“He likes puppies”). They found that sharing personal opinions activated the same brain circuits that respond to rewards like food and money. So talking about what you did this weekend might feel just as good as taking a delicious bite of double chocolate cake.
    In fact, people like sharing their attitudes so much that they are even willing to pay money to do it. In another study, Tamir and Mitchell asked people to complete a number of trials of a basic choice task. Participants could choose either to hang out for a few seconds or answer a question about themselves (such as “How much do you like sandwiches?”) and share it with others. Respondents made hundreds of these quick choices. But to make it even more interesting, Tamir and Mitchell varied the amount that people got paid for choosing a particular option. In some trials people could get paid a couple of cents more for choosing to wait for a few seconds. In others they could get paid a couple of cents more for choosing to self-disclose.
    The result? People were willing to forgo money to share their opinions. Overall, they were willing to take a 25 percent pay cut to share their thoughts. Compared with doing nothing for five seconds, people valued sharing their opinion at just under a cent. This puts a new spin on an old maxim. Maybe instead of giving people a penny for their thoughts, we should get paid a penny for listening.
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    It’s clear that people like to talk about themselves, but what makes people talk about some of their thoughts and experiences more than others?
    Play a game with me for a minute. My colleague Carla drives a minivan. I could tell you many other things about her, but for now, I want to see how much you can deduce based solely on the fact that she drives a minivan. How old is Carla? Is she twenty-two? Thirty-five? Fifty-seven? I know you know very little about her, but try to make an educated guess.
    Does she have any kids? If so, do they play sports? Any idea what sports they play?
    Once you’ve made a mental note of your guesses, let’s talk about my friend Todd. He’s a really cool guy. He also happens to have a Mohawk. Any idea what he’s like? How old he is? What type of music he likes? Where he shops?
    I’ve played this game with hundreds of people and the results are always the same. Most people think Carla is somewhere between thirty and forty-five years old. All of them—yes, 100 percent—believe she has kids. Most are convinced those kids play sports, and almost everyone who believes that guesses that soccer is the sport of choice. All that from a minivan.
    Now Todd. Most people agree that he’s somewhere between fifteen and thirty. The majority guess that he’s into some sort of edgy music, whether punk, heavy metal, or