I. Introduction
Traditional media have a long history in covering disasters and crises. As several examples of recent natural disasters have shown, social media can provide additional useful and effective information which in turn can lead to significantly improved situational awareness for decision makers and planners [1], [2]. Social media combine with traditional media in various ways - sparking off initial coverage, providing different and unfiltered angles or amplifying information - and produce a wide spectrum of coverage of an event. In the process, the boundaries between social media and traditional media and the different types of sources have become increasingly blurred as news providers use social media as alternative channels. As helpful as all this information may potentially be to disaster relief organizations, it usually comes in multiple formats, multiple languages, immense amounts, across multiple media and is generally unstructured and inhomogeneous. Stakeholders have to survive in this dynamic world with a 24-hour news-cycle and manage information and communications. Events will be reported about - whether they participate or not - putting pressure on them to compete and fill the information void [3].