A related development has been the popularity of streaming video websites (exemplified by YouTube), coupled with the ubiquity of mobile phones with cameras capable of recording video content, facilitating ”citizen journalism”. Social network sites (such as Twitter and Facebook) have also become important sources of information and communications directly connecting citizens to one another. These sites provide alternative channels of commentary and distribution where citizens filter, assess, discuss and share news stories. Social networks become particularly useful when disseminating information in complex humanitarian disasters where traditional communication networks have collapsed, such as during the recent earthquakes in Haiti and Chile, or more recently hurricane Sandy in the Americas.