I started a list of critical questions for big data in education earlier this week. This is a big topic, raising lots of big questions and serious topics and problems for further debate and discussion. Here, I focus on questions about big data ownership, divides, algorithmic accountability, issues about voice and literacy, and, finally, ethical implications and challenges of big data in education. Who “owns” educational big data? The sociologist Evelyn Ruppert has asked, “who owns big data?” noting that numerous people, technologies, practices and actions are involved in how data is shaped, made and captured.