Pollchain is a knowledge sharing social networking service that allows users to ask and answer various questions through polling. The platform follows a protocol economic model that ensures fair sharing of rewards among its users. The accumulated big data, user analysis index and advertisement orders are jointly created by users, and the rewards for consuming ads are given through POLL tokens. Pollchain aims to provide a combination of polling and advertisement to its users, which increase the platform's value and gain more users. The launch of the Greece stage enables Pollchain users to learn about the system and vote on content and proposals easily.