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Mark Zuckerberg (L) and Sean Parker (R). Photos: Steven Senne/AP, Axios video

Sean Parker, the founding president of Facebook, gave me a candid insider's look at how social networks purposely hook and potentially hurt our brains.

Be smart: Parker's I-was-there account provides priceless perspective in the rising debate about the power and effects of the social networks, which now have scale and reach unknown in human history. He's worried enough that he's sounding the alarm. Parker, 38, now founder and chair of the Parker Institute for Cancer Immunotherapy, spoke yesterday at an Axios event at the National Constitution Center in Philadelphia, about accelerating cancer innovation. In the green room, Parker mentioned that he has become "something of a conscientious objector" on social media. By the time he left the stage, he jokingly said Mark Zuckerberg will probably block his account after reading this:

"When Facebook was getting going, I had these people who would come up to me and they would say, 'I'm not on social media.' And I would say, 'OK. You know, you will be.' And then they would say, 'No, no, no. I value my real-life interactions. I value the moment. I value presence. I value intimacy.' And I would say, ... 'We'll get you eventually.'""I don't know if I really understood the consequences of what I was saying, because [of] the unintended consequences of a network when it grows to a billion or 2 billion people and ... it literally changes your relationship with society, with each other ... It probably interferes with productivity in weird ways. God only knows what it's doing to our children's brains." "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?'" "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." "It's a social-validation feedback loop ... exactly the kind of thing that a hacker like myself would come up with, because you're exploiting a vulnerability in human psychology.""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." P.S. Parker, on life science allowing us to "live much longer, more productive lives": "Because I'm a billionaire, I'm going to have access to better health care so ... I'm going to be like 160 and I'm going to be part of this, like, class of immortal overlords. [Laughter] Because, you know the [Warren Buffett] expression about compound interest. ... [G]ive us billionaires an extra hundred years and you'll know what ... wealth disparity looks like."Go deeper: See the video of Parker's comments.

Go deeper: Joe Biden rips Trump's "phony nationalism".

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Go deeper

Updated 1 hour ago - Politics & Policy

Capitol Police recommend disciplinary action against 6 officers for riot conduct

Pro-Trump supporters storm the U.S. Capitol on Jan. 6 Photo; Samuel Corum/Getty Images

Capitol Police on Saturday recommended disciplinary action for six officers over their alleged roles in the Jan. 6 insurrection.

Why it matters: The announcement follows an internal investigation into officers' conduct during the Capitol riot, which saw six officers suspended with pay and 29 are others under investigation for their conduct during the attack.

Updated 3 hours ago - Sports

College football teams honor 20th anniversary of 9/11

The Virginia Cavaliers marching band performs as an American flag is displayed to commemorate 9/11 at halftime during a game at Scott Stadium on Sept. 11. Photo: Ryan M. Kelly/Getty Images

College football teams across the country unveiled tributes — from halftime shows to special uniforms — on Saturday in honor of the 20th anniversary of 9/11.

The big picture: Some schools honored alumni and veterans on their uniforms, others put together tributes to remember those who died. Nearly all held a moment of silence before kickoff.

Updated 5 hours ago - Politics & Policy

Biden attends wreath-laying ceremony at Pentagon

President Biden, first lady Jill Biden, Vice President Harris and second gentleman Doug Emhoff attend a wreath-laying ceremony at the National 9/11 Pentagon Memorial on Sept. 11, 2021 in Arlington, Virginia. Photo: Kevin Dietsch/Getty Images

President Biden participated in a wreath-laying ceremony at the Pentagon on Saturday to commemorate the 20th anniversary of the 9/11 attacks.

The latest: Biden and first lady Jill Biden arrived at the Pentagon after visiting the Flight 93 memorial in Shanksville, Pennsylvania, and Ground Zero in New York City.