This document describes the methodology used to develop the Geneva Social Media Index (GSMI) which analyzes Twitter use among permanent missions to the UN, NGOs, and international organizations in Geneva. The GSMI measures social media activity and reception using indicators like production, contribution, responsiveness, interest, retweets received, popularity, follower level, and publicity. Accounts are ranked on both activity and reception indicators and given an overall GSMI score to balance those that are popular due to outside factors versus those that achieve popularity through effective social media management. The goal is to recognize accounts that optimize their online representation through dynamic strategies on Twitter.