Zuckerberg has long been a supporter of gay marriage and celebrated Pride in Omaha in 2017. "Until recently, the Nebraska constitution banned gay marriage," he wrote. "Omaha is more welcoming, but we still have a long way to go." After Trump tweeted that he would try to stop transgender people from serving in the U.S. military, Zuckerberg posted: "Everyone should be able to serve their country -- no matter who they are."
Zuckerberg is not a big believer in our current prison system. Through CZI, he has donated to an effort to compile more data about U.S. prisons, and criticized the prison system after a trip to a juvenile detention center in Indiana. "The most striking fact is that those kids are more likely to become criminals after going through detention than they were before they went in," Zuckerberg wrote. "The correctional system is building a negative and self-reinforcing social network." He also spent time this summer with a wrongfully convicted death row inmate in Alabama.
Freedom of the press
Zuckerberg likes the first amendment. "I don't always agree with everything you say, but that's how democracy is supposed to work."
Zuckerberg and his wife Chan, who is a teacher, are huge proponents of the concept of "personalized learning," or the idea that all students learn differently and at their own pace. CZI is spending to support this philosophy in the Bay Area. Zuckerberg and Chan also donated $100 million to help revitalize New Jersey's Newark public school system, though that didn't go quite as well as planned.
Technology and internet safety
Zuckerberg is a supporter of encryption technologies — not a shock since Facebook owns multiple messaging apps that offer end-to-end encrypted messages. When Apple had a fight with the FBI about unlocking an iPhone following the San Bernardino shooting a few years back, Zuckerberg threw his support behind Apple. "We believe in encryption...I expect it's not the right thing to try to block that from the mainstream products people want to use. And I think it's not going to be the right regulatory or economic policy to put in place."
Zuckerberg is a strong supporter of net neutrality. "If we want everyone in the world to have access to all the opportunities that come with the internet, we need to keep the internet free and open," he wrote.
This is a major priority for Zuckerberg and Facebook. The company has tried to offer free internet services in developing markets in the past, and is currently financing the creation of internet beaming drones, and the laying of fiber cable in Africa.
Zuckerberg and Facebook are building lots of artificial intelligence software, but it's unclear where he falls on the debate around regulation. After Tesla's Elon Musk told a group of America's governors earlier this year that they needed to regulate AI before it was too late, Zuckerberg said Musk's doomsday warnings were "irresponsible."
After a trip to Alaska this summer, Zuckerberg seemed to support the idea of a basic, government-provided income. "Alaska's economy has historically created this winning mentality, which has led to this basic income. That may be a lesson for the rest of the country as well," he wrote on his Facebook page.
Zuckerberg has called for more affordable housing in the Bay Area, with the great irony being that Facebook (and many other tech companies) are often blamed for the ridiculous high housing prices. Facebook recently unveiled plans for a new campus that will include more than 200 apartments to rent "below market prices."
—By Kurt Wagner, Re/code.net.
CNBC's parent NBCUniversal is an investor in Recode's parent Vox, and the companies have a content-sharing arrangement.