Instagram's API can publish Reels, but only to professional accounts, through a container-then-publish flow, and only to accounts you manage until Meta's App Review. A practical guide to both login paths, the specs and the daily limit.
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.