Yacs is a social networking platform that allows businesses to better engage with customers. It provides tools for communication, content management, and collaboration. Yacs uses a flexible data model of shared objects to integrate various business processes. It aims to focus businesses back on their customers by facilitating interactions and consolidating customer information in one place. Yacs is open source software that leverages common web technologies like PHP, MySQL, and AJAX to provide a customizable and scalable solution for companies.