In this summary, we built a core feature of a social CRM using Django and Vonage Messages API. We created two apps: `lead_manager` to manage leads and `conversation` for sales agents to communicate with potential customers on Facebook in real-time. We set up a WebSocket consumer in the `conversation` app to enable communication between SalesFox agents and leads in real-time. We also created a property method `messages` for the `Lead` model to return all incoming and outgoing messages of a lead. Additionally, we defined URL configurations for both apps and created frontend files with HTML templates and CSS stylesheets. Finally, we got SalesFox running locally by setting up an HTTP tunnel with Ngrok, defining environment variables, and updating the Vonage application page.