Since the beginning of the 20th century, developments in information and communication technologies have radically transformed and digitised our daily lives. Every individual in the digital ecosystem, continually participates in data production by leaving digital traces. These data stacks, which could not be processed in a reasonable time with existing software or human resources, are called big data. Those who are pro-big data, emphasise its potential to improve our understanding and perception of world affairs. However, there is a need for data journalists to be "digital watchdogs" (Felle, 2015; 2016) that will make sense of the data and reveal the stories hidden in them for the public good. The discussion of big data in the context of journalism started with the Wikileaks in 2010. Data journalism has come to the fore as a new practice covering the stages of cleaning, editing , visualising, processing and contextualising data. Investigative data journalism (Mair, & Keeble, 2013), which seeks to "find what is hidden in the shadows" based on infor-mal/confidential data, and to find the relationships in it, is emphasised as an important tool of democracy. Both professionals and academics assume that; the media, which has been gradually losing blood under the influence of neoliberal, conservative and authoritarian governments , could regain the fourth power function with the aid of investigative data journalism.