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Adopting a comparative cross-platform approach, we examine youth political expression and conversation on social media, as prompted by popular culture. Tracking a common case study—the practice of building Donald Trump’s border wall within the videogame Fortnite—across three social media platforms popular with youth (YouTube, TikTok, Instagram), we ask: How do popular culture artifacts prompt youth political expression, as well as cross-cutting political talk with those holding different political views, across social media platforms? A mixed methods approach, combining quantitative and qualitative content analysis of around 6,400 comments posted on relevant artifacts, illuminates youth popular culture as a shared symbolic resource that stimulates communication within and across political differences—although, as our findings show, it is often deployed in a disparaging manner. This cross-platform …