Waseem builds Reelspan, the publishing API and dashboard that posts one video to every social platform. He spends his days in the platforms’ developer documentation so you don’t have to, and every factual claim here links to its source.
Which video shapes TikTok, YouTube, Instagram, Facebook, Threads, X, LinkedIn, Pinterest and Bluesky accept, which one each prefers, and how to make one master video work on all of them.
Cross-posting one video to TikTok, YouTube, Instagram, Facebook, X, LinkedIn, Threads, Pinterest and Bluesky is mostly the same job nine times, except for the parts that aren't. A field guide to what changes per platform: shape, length, captions, privacy, scheduling and AI labels.
Instagram, TikTok and YouTube each have a built-in scheduler, with different rules on who can use it, how far ahead you can schedule and what doesn't work. Step by step for all three, from their own help pages, plus when a cross-platform scheduler makes more sense.
The Model Context Protocol lets assistants like Claude and ChatGPT call real tools, including ones that publish to social media. How it works, how to connect a publishing server, and the guardrails to put in place before an agent can post for you.
Every post from an unaudited TikTok app is private, and at most five people a day can use it. Here is what the Content Posting API audit checks, and the Direct Post screen TikTok requires before it lets your posts go public.