This document discusses the use of social media, particularly Twitter, during crises and natural disasters. It analyzes the hashtags #qldfloods and #eqnz which were used during the 2011 Queensland floods in Australia and the 2011 Christchurch earthquake in New Zealand. The analysis shows how Twitter was used to coordinate information sharing during the crises and how official accounts helped establish hashtags and amplify key messages. It also compares Twitter usage and themes between the different events.