Instagram Hashtag Finder in n8n: OpenAI + Google Sheets

Find better Instagram hashtag targets automatically—daily

This Instagram Hashtag Finder n8n workflow pulls top-performing Instagram posts for your chosen hashtags using the Meta (Facebook) Graph API, then uses OpenAI to score relevance and draft engagement-ready comment ideas. High-scoring posts are appended to a Google Sheets review digest—so you always know what to engage with next.

What this workflow does

• Runs daily at 9:00 on a schedule to keep your discovery pipeline fresh.
• Accepts a comma-separated hashtag list, splits it, and looks up each hashtag ID via the Meta (Facebook) Graph API.
• Fetches top media for each hashtag from the Instagram Graph API and selects the top posts per hashtag by total engagement.
• Uses OpenAI to:
  • score each post’s relevance,
  • create a one-sentence summary,
  • explain why to engage, and
  • draft three comment options in your specified brand voice.
• Formats results into a digest row (including links, metrics, and AI outputs) with a default status of “To Review”.
• Filters to posts with a relevance score of 6 or higher and appends them to your chosen Google Sheets document.

Use cases

• Social media teams maintaining a daily engagement queue of high-fit posts by hashtag.
• SaaS operators validating which topics and communities are responding well (by engagement + AI relevance).
• Automation engineers using OpenAI + Graph API data to build a structured review workflow.

Technical details

• Integrations/Credentials: Meta (Facebook) Graph API (Instagram Business/Creator), OpenAI, Google Sheets.
• n8n nodes used: set, code, filter, http request, google sheets, plus sticky note for workflow clarity.
• Setup requirements: connect Meta Graph API access, set your Instagram user ID, connect an OpenAI chat model credential, and ensure your Google Sheets headers match the digest fields written by the workflow.