This document discusses bottom-up innovation on Twitter. It highlights four stories: 1) Twitter is an opportunity for every voice to be heard, 2) examples of serendipitous discovery and charity drives on Twitter, 3) how Twitter is used to build community through tweetups and meetups, and 4) how apps are revolutionizing Twitter. The overall tone is one of inspiration from the diversity of people, ideas, and leaders/followers that engage on Twitter.