The document introduces a survey to collect data on how companies have implemented Enterprise Social Networks (ESNs). The author is creating an "ESN Playbook" to help others navigate the challenges of rolling out an ESN based on lessons learned from their experience at ING. Readers who have led an ESN implementation are asked to take a short survey or volunteer for a longer discussion to share their insights on what went well, where they struggled, how success is defined, and other themes to inform the playbook.