A year ago Instagram made a bold bet with the launch of IGTV: That it could invent and popularize a new medium of long-form vertical videos. Landscape uploads weren’t allowed. Co-founder Kevin Systrom told me in August that “What I’m most proud of is that Instagram took a stand and tried a brand new thing that is frankly hard to pull off. Full-screen vertical video that’s mobile only. That doesn’t exist anywhere else.
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