As a handful of data platforms generate massive amounts of user data, the barriers to entry rise since potential competitors have little data themselves to entice advertisers compared to the incumbents who have both the concentrated processing power and supply of user data to dominate particular sectors. The upshot of this market power by big data platforms is that the marketplace is doing little to create options for consumers that might alleviate the misuse of consumer data or encourage big data platforms to better compensate users who are willing to share their data. Data Justice has been launched as a project to promote public education and new alliances to challenge the danger of big data to workers, consumers and the public. … Data Justice