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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

First-time homebuyers shrink as prices spike

Data: National Association of Realtors; Chart: Axios Visuals

Home sales cooled as prices continued to heat up in August.

Driving the news: The share of first-time existing homebuyers (29%) last month was the smallest in two years, according to new data from the National Association of Realtors.

Mike Allen, author of AM
1 hour ago - World

Airbnb doubles number of Afghan refugees it will house to 40,000

Afghan refugees arriving at Dulles International Airport in Virginia in August 2021. Photo: Kent Nishimura/Los Angeles Times via Getty Images

Airbnb CEO Brian Chesky and co-founder Joe Gebbia said during a visit to Washington on Wednesday that they're offering temporary housing to 40,000 Afghan refugees worldwide, doubling a previous commitment.

The big picture: The housing typically lasts several weeks, and Airbnb and Airbnb.org provide subsidies to hosts.

Florida lawmaker introduces abortion bill modeled after Texas law

A view of the old Florida Capitol building, which sits in front of the current new Capitol building, in Tallahassee. Photo: Mark Wallheiser/Getty Images

A Florida lawmaker introduced a bill Wednesday modeled after Texas' new law prohibiting abortions after a fetal heartbeat is detected, or roughly six weeks — before many people know they are pregnant.

Why it matters: Similar bills introduced to the Florida legislature have failed, but that was before the Supreme Court declined to block Texas' law, which is the most restrictive abortion law to be enforced since the Supreme Court's Roe v. Wade decision legalized abortion nationwide in 1973, according to AP.