He taught fourth grade, ran for the U.S. Senate, and now runs the social network where the bots are turned away at the door.
The man who turned down PAC money now turns down bots. Same instinct, different battlefield.
In December 2025, Australia switched off social media for anyone under 16. One app kept its lights on: Zigazoo. Within days it sat at number two on the country's App Store, and its CEO posted a single line that doubled as a thesis statement.
"Finally, everyone is coming around and starting to see that the future of social media isn't junk food."
- Zak Ringelstein, on LinkedIn after the Australia exemptionZak Ringelstein has spent a decade arguing that the people building things for children should answer to the children, not to an algorithm's appetite. Zigazoo is the latest version of that argument: a video-first social network where every account is checked by a human, content is screened to be free of bots, and there is no public like count to chase. He calls the ambition the "Whole Foods of social media" - the idea being that you can still have the thing, you just make it nourishing instead of addictive.
The pitch lands because Ringelstein is not a technologist who discovered education. He is a teacher who learned to ship software. He stood in front of classrooms in Arizona and in Tanzania before he ever stood in front of a venture capitalist, and the order of those experiences shows up in everything Zigazoo does.
Ringelstein joined Teach For America out of college and was assigned to Isaac School District #5 in Arizona, one of the lower-income districts in the state. He later taught at the International School of Tanganyika and spent time as a researcher on the United Nations Millennium Villages Project. The throughline was not technology. It was the gap between what kids could do and what the systems around them allowed.
That gap became his first company. In 2013 he co-founded UClass, a platform meant to help schools organize and share learning materials. It worked well enough that Renaissance Learning acquired it in 2015, before Ringelstein turned 30. He had built the thing teachers wished they had, then handed it to a company that could put it everywhere.
He could have stayed in edtech and compounded the win. Instead he ran for office.
In 2018, Ringelstein won the Democratic primary for U.S. Senate in Maine and faced incumbent independent Angus King. The campaign was unusual on purpose. He refused money from corporations, political action committees, lobbyists, and the fossil fuel industry, and he was the only major-party Senate candidate that cycle who was a dues-paying member of the Democratic Socialists of America.
"I think we need working class people at the table."
- Zak Ringelstein, 2018 Senate campaignKing won re-election. Ringelstein lost the seat but kept the operating principle: refuse the easy money, stay accountable to the people you claim to serve. Two years later, that principle would become a product decision instead of a campaign slogan.
When the pandemic shut schools in 2020, Ringelstein and his wife Leah Ringelstein built Zigazoo as a place for kids to answer creative video challenges and share them safely. The premise was almost old-fashioned: project-based learning, dressed up as a feed kids actually wanted to open. It grew into something broader - a moderated social network positioned squarely against the platforms parents fear.
The differentiators are deliberately unglamorous. Every account is vetted for authenticity by a real person. Content detection systems screen for AI-generated material. There is human moderation at the core rather than as a cleanup crew. In an industry that treats trust and safety as a cost center, Zigazoo treats it as the product.
Every account is checked by a real person and content is screened to keep the network free of bots and AI-generated junk.
The app is built so creators see the faces of their fans instead of chasing numbers - positivity engineered into the interface.
Zigazoo launched kid-friendly NFTs with partners including Moonbug and Serena Williams, betting kids have always been collectors and traders.
In June 2022 Zigazoo closed a $17 million Series A led by Liberty City Ventures, bringing total funding to roughly $26 million. The investor list is its own headline: the NBA, Dapper Labs, Animoca Brands, Causeway, OneFootball, Medici VC, and tennis great Serena Williams, alongside earlier backer MaC Venture Capital. For a company whose core promise is keeping children safe, the willingness of mainstream institutions to write checks said the thesis had moved from fringe to obvious.
"We're not going to be in a world where social media doesn't exist. But we need to come up with something that is healthier, safer, and protects adolescents from toxicity, bullying, and too much screen time."
- Zak RingelsteinTheory and human rights - the foundation he kept circling back to.
A master's in education earned alongside his classroom years.
Doctoral work tying the two threads of his life together.
Ran a Senate campaign refusing all corporate, PAC, lobbyist, and fossil fuel money - then turned the same "refuse the easy stuff" instinct into a no-bots product rule.
Built Zigazoo with his wife, Leah Ringelstein. A family business aimed at families.
Named to the Forbes 30 Under 30 list.
Has taught in Phoenix and in Tanzania - the same week's lesson plan, two very different rooms.
Argues today's kids are a generation of creators, not just consumers - and designs the app to treat them that way.
Sold his first company, UClass, to Renaissance Learning before turning 30.
A longer-form conversation with Ringelstein on building in the kids' media space: