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Vertical video has moved from a mobile quirk to the dominant ad format across the US digital landscape. But TikTok, Instagram Reels, YouTube Shorts, and the platforms chasing them aren't interchangeable—each operates with distinct audiences, engagement mechanics, and cost structures that should drive very different creative and budgeting decisions.
The era of two-platform dominance in digital advertising is giving way to a more complex, fragmented ecosystem. Connected television, podcast networks, TikTok Shop, and AI-driven contextual networks are drawing meaningful budget allocations away from Google and Meta, and the shift reflects a fundamental change in how American consumers engage with media. This analysis examines which platforms are gaining ground and why forward-thinking marketers are diversifying their ad spend now.