Threads API vs the official Meta Threads API — what is the difference?

Official Threads APIs serve partner and user-authorized app use cases (publish, insights, reply management) and require a Meta app plus OAuth and App Review for production scopes. Social Fetch is a public-data lookup API: handle, URL, or query in, structured JSON out, no creator OAuth. Choose official when you need write access or private user data on accounts you manage; choose Social Fetch for public enrichment and monitoring.