In the wake of last year's U.S. election, in which Russian interference and "fake news" on social networks became major topics, many are rethinking the role of social media in our society.
Adding his voice to the list of critics is Sean Parker, who in 2004 became the first person to serve as president of Facebook. During a talk in Philadelphia this week, Parker warned consumers that the social network, like other social media sites, was designed to exploit people's psychological vulnerabilities.
"God only knows what it's doing to our children's brains," said Parker, according to Axios.
He joked that his comments could get him barred from Facebook.
Watch: Facebook pledges security boost after Russian ads
"The thought process that went into building these applications, Facebook being the first of them... was all about 'How do we consume as much of your time and conscious attention as possible?'" Parker said.
"And that means that we need to sort of give you a little dopamine hit every once in a while, because someone liked or commented on a photo or a post or whatever. And that's going to get you to contribute more content, and that's going to get you... more likes and comments."
He described Facebook as ""a social-validation feedback loop" that is "exactly the kind of thing that a hacker like myself would come up with," because it exploits a psychological vulnerability.
Parker started out as a co-founder of the music-sharing site Napster, before becoming involved with Facebook. His tenure at the social media site didn't last long; he was asked to resign in 2006 after police found cocaine in a vacation home he was renting.
Many media critics have begun arguing that the business model of Facebook and some other social media sites encourages extremism by creating echo chambers in which ideas spread without being contested, and by rewarding controversial ideas with greater exposure.
Questioning the role of social media
Parker is among a growing number of tech insiders whose consciences have begun to eat at them in the wake of the social media explosion.
In a widely shared post last year, former Google employee Tristan Harris outlined how tech companies capture the minds of users.
He wrote that product designers "play your psychological vulnerabilities (consciously and unconsciously) against you in the race to grab your attention".
Like magicians, social media apps "give people the illusion of free choice, while architecting the menu so that they win, no matter what you choose".
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In an Atlantic article in 2014, programmer Ethan Zuckerman, the principal research scientist at MIT's Media Lab, apologised for his role in creating pop-up ads in the 1990s.
"I wrote the code to launch the window and run an ad in it. I'm sorry. Our intentions were good," he wrote.
But in his comments this week, Parker argued that the big brains behind big social networks knew exactly what they were doing when they developed their sites' advertising-based models.
"The inventors, creators — it's me, it's Mark [Zuckerberg], it's Kevin Systrom on Instagram, it's all of these people — understood this consciously. And we did it anyway," he said.
Parker described himself as a "conscientious objector" to social media, though he does maintain a presence on Facebook and Twitter.