To combat the issue of guests not sharing photos, a photo guest book was built on top of WhatsApp using Twilio and Node.js. The application allows users to send messages with images, which are then stored and displayed on a website. The bot responds to user input, confirming receipt of images and reminding users to share more. A messaging service is created to schedule reminders and notifications. The project uses the Twilio Serverless platform, React for the frontend, and Node.js for the backend. The application can be deployed to Twilio's serverless functions and assets can be hosted from the `assets` folder.