This document discusses Cofacts, a chatbot created to combat the spread of misinformation. Cofacts allows users to check facts by sending messages to the chatbot on Line. The chatbot will then search its database and the internet to verify claims or find context about the information. It provides concise replies indicating whether a claim is accurate or contains misinformation. Cofacts aims to stop the spread of rumors by making fact-checking more accessible and collaborative. It hopes to increase transparency by open sourcing its data and process so others can trace how information spreads over time.