Overview

Four networks, one API. The differences you have to design around are limits, media rules and whether first comments work — everything else behaves identically. The practical consequence of that table is that a single content string has to satisfy every target you send it to. Two ways to handle it:

• Write to the strictest limit. 280 characters satisfies all four.
• Send separate requests per network. More calls, but each gets copy that fits — which is usually what you want anyway, since a post that reads well on LinkedIn rarely does on Threads.

firstComment is already per target, so the comment can differ even within one request.

• Instagram — professional accounts, JPEG only, Reels and carousels
• Threads — text-only posts, carousels, replies as comments
• X — no comments, and the one network where a link changes the price
• LinkedIn — personal profiles and company pages

Every network above is available on Chirio. If one is ever unavailable — a platform outage, a suspended integration — calls targeting it answer 501 platform_not_enabled rather than failing silently, and existing connections are untouched. A connection carries the permissions it was granted at the moment the user approved it. If a capability is added later, existing connections do not gain it — the user has to reconnect. This is the cause behind a few otherwise confusing failures, all covered in Account lifecycle.