This document presents a maturity stages model for social media-based citizen-sourcing by government agencies. It describes 5 stages of maturity: 1) Setting up and manually operating multiple social media accounts. 2) Centrally managing the operation of multiple social media accounts from a single ICT platform. 3) Centrally monitoring "external" social media accounts and internet sources in addition to internal accounts. 4) Monitoring external accounts with quality filtering to provide high quality expert information. 5) Internal dissemination and consultation of collected citizen and expert information and opinions to facilitate policy development. The model was developed through several EU projects focused on exploiting social media in government. It aims to balance citizen input