Automated Facebook Comment Management with GPT-4 and LangChain

### Facebook AI Agent with MCP Server - Built for Smart Engagement and Automation #### Hi! I'm Amanda - I build intelligent automations with n8n and Make. This powerful workflow was designed to help teams automatically handle Facebook page interactions with AI. Using **Meta Graph API**, **LangChain**, **MCP Server**, and **GP-4o**, it allows your AI agent to **search for posts, read captions, fetch comments**, and even **reply or message followers**, all through structured tools. --- ### What the workflow does - Searches for recent media using Facebook Page ID and access token - Reads and extracts captions or media URLs - Fetches comments and specific replies from each post - Replies to comments automatically with GP-generated responses - Sends direct messages to followers who commented - Maps user input and session to keep memory context via LangChain - Communicates via Server-Sent Events (SSE) using your MCP Server URL --- ### Nodes & Tech Used - `LangChain Agent` + `Chat Model` with GP-4o - `Memory Buffer` for session memory - `toolHttpRequest` to search media, comments, and send replies - `MCP Trigger` and `MCP Tool` (custom SSE connection) - `Set` node for input and variable assignment - `Webhook` and JSON for Facebook API structure --- ### Setup Instructions 1. Create your Facebook App in Meta Developer Portal 2. Add your **Facebook Page ID** and **Access Token** in the `Set` node 3. Update the **MCP Server Tool URL** in the `MCP Facebook` node - Use your n8n server URL (e.g. `https://yourdomain.com/mcp/server/facebook/sse`) 4. Trigger the workflow using the included `LangChain Chat Trigger` 5. Interact via text to ask the agent to: - “Get latest posts” - “Reply to comment X with this message” - “Send DM to this user about...” --- ### Who this is for - Social media teams managing multiple Facebook pages - Brands automating engagement with followers - Agencies creating smart, autonomous digital assistants - Developers building conversational bots for Facebook --- ### Requirements - Meta Graph API access - Facebook Page (with permissions) - n8n instance (Cloud or Self-hosted) - MCP Server configured (SSE Endpoint enabled) - OpenAI API Key (for GP-4o + LangChain) --- ### Want to use this workflow? - Buy workflows: [https://iloveflows.com](https://iloveflows.com) - Try n8n Cloud: [https://n8n.partnerlinks.io/amanda](https://n8n.partnerlinks.io/amanda)

Platform

n8n

Category

Social Media

Price

Free

Creator

Amanda Benks

• Fluxo a Venda
• set
• stickyNote
• agent
• mcpTrigger
• chatTrigger
• lmChatOpenAi
• mcpClientTool
• toolHttpRequest
• memoryBufferWindow