OpenAI Social Captions Workflow for n8n: SocialRobot Auto-Post

Auto-Generate & Publish Social Captions from One Topic (OpenAI + SocialRobot in n8n)

Turn a single content idea into platform-ready social post captions—then publish them automatically to Instagram, X (Twitter), LinkedIn, TikTok, Facebook, Pinterest, Bluesky, Mastodon, and Threads using the SocialRobot API. This OpenAI-powered Social Captions Workflow for n8n helps you generate consistent, tone-specific copy in seconds.

What this workflow does

• Manual execution: Runs when you manually trigger the workflow in n8n.
• Set topic + tone: You provide a post topic and desired tone for the generated captions.
• Generate platform-specific captions: The workflow uses OpenAI (GPT-4o-mini) to create optimized text for each target platform and parses it into structured fields.
• Publish via SocialRobot: It posts the generated captions (and a configured public media URL where required) to each selected platform through SocialRobot.
• Platform mapping: For every publish step, you select the correct SocialRobot account ID per platform.
• Media + Pinterest setup: Replace placeholder media URLs with your public image/video URLs, and set your Pinterest board ID in the Pinterest publish configuration.

Use cases

• SaaS operators launching a feature: generate consistent captions for multiple channels from one announcement.
• Automation engineers validating multi-platform publishing pipelines with OpenAI-generated content.
• Social teams maintaining a specific brand tone (e.g., professional, educational) across Instagram, LinkedIn, X, and more.

Technical details

• n8n nodes: manual trigger, Set, Sticky Note, n8n-nodes-langchainagent, n8n-nodes-langchainlm (OpenAI Chat Model), and n8n-nodes-langchainoutput (Structured).
• OpenAI integration: Uses GPT-4o-mini via an OpenAI Chat Model configuration.
• Social publishing: SocialRobot community node with a SocialRobot API key/credential, posting to Instagram, Facebook, Bluesky, LinkedIn, Mastodon, Pinterest, Threads, TikTok, and X (Twitter).