Auto-comment on Instagram posts with GPT-4o, Phantombuster, and SharePoint

Who’s it for

Social-media teams and influencers who want to grow engagement by
automatically posting short, relevant comments on new Instagram posts
under rotating hashtags—while staying under platform limits.

How it works / What it does

1. Schedule Trigger fires every 2 h at a specified minute.
2. Select Cookie chooses a rotating Instagram session-cookie by
   time slice.
3. Generate Random Hashtag (GPT-4o) outputs a realistic AI/BPA tag.
4. Hashtag Agent (Phantombuster) scrapes up to
   ENV_MAX_POSTS_PER_HASHTAG recent posts.
5. Get Random Post picks one; Create Comment (GPT-4o) crafts a
   ≤150-character reply in the chosen language.
6. Builds instagram_post_to_comment.csv, uploads to SharePoint, then
   launches the Auto-comment Agent which posts the reply.
7. Post URL is logged to instagram_posts_already_commented.csv
   to avoid duplicates.
8. Wait nodes throttle launches to ≈80 comments/day.

How to set up

1. Add credentials: Phantombuster API, SharePoint OAuth2, OpenAI API key.
2. In SharePoint › “Phantombuster” folder create:
   • instagram_session_cookies.txt – one cookie per line.
   • instagram_posts_already_commented.csv with header postUrl.
3. Edit Set ENV Variables to set default language, prompt, and max
   posts per scrape.
4. Activate the workflow; it will comment every 2 h.

Requirements

• n8n 1.33 +
• Phantombuster Growth plan (API access)
• OpenAI account (GPT-4o)
• Microsoft 365 SharePoint tenant

How to customize

• Change tone/length: tweak prompt in Create Comment.
• Comment more often: raise ENV_MAX_POSTS_PER_HASHTAG,
  adjust cron, and agent limits.
• Swap SharePoint for Drive/Dropbox by replacing storage nodes.