aid relief / humanitarian agencies, disasters / accidents, droughts, emerging market countries, environment, general news, government / politics, human rights / civil rights, internet / world wide web, news, non-governmental organizations, society / social issues, south america, south america / central america, technology (trbc level 1), technology / media / telecoms, utilities (trbc level 2), water, water & related utilities (trbc level 4), ウーバー