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Social media automation,
explained.

Field notes from building Cast Forge: how the Pinterest, Instagram, Facebook and Threads APIs really behave, what each feed accepts, and how to post at a pace the networks trust.

Meta’s two-step publishing flow: create a media container, poll its status until FINISHED, then publish
Meta APIs

Auto-posting to Instagram and Threads: containers, limits and the 4:5 rule

How the Instagram and Threads APIs publish: two-step media containers, status polling, the 100 and 250 posts-a-day limits, image rules and token lifetimes.

· 8 min read
Request flow: OAuth token, list boards, POST /v5/pins with a base64 image, and the 429 retry loop Pinterest API

Creating Pins with the Pinterest API v5: OAuth, boards, images and rate limits

Publish Pins with the Pinterest API v5: OAuth and token refresh, finding or creating boards, base64 image uploads, and Trial vs Standard rate limits.

· 7 min read The same product framed four ways: a 2:3 Pinterest pin, a 4:5 Instagram post, a Facebook photo and a Threads image Images

One product photo, four feeds: image sizes for Pinterest, Instagram, Facebook and Threads

What each network accepts through its API (Pinterest 2:3, Instagram 4:5 to 1.91:1, Threads up to 1440 px) and how to render one photo for all four.

· 6 min read Daily post counts over eight weeks: a warm-up ramp from 1 to 10 posts a day with natural variation and rest days Scheduling

Posting at a human pace: warm-up, jitter and spacing rules for automated accounts

Scheduling rules for safe social automation: a weekly warm-up ramp, ±30% daily variation, random times in a window and gaps between repeats of a link.

· 7 min read Pipeline: a sitemap feeds a crawler, a planner reserves empty slots, and copy and images are made 6 hours before each post Architecture

From product sitemap to social posts: a pipeline that keeps AI costs flat

Turn a store’s sitemap into scheduled social posts: crawl product pages, pick the right photo, reserve slots first, write AI copy hours before posting.

· 7 min read

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