ROME — Pope Francis warned of the dangers of “Big Data” Wednesday, noting “algorithms are not neutral” and can be used to spread fake news and create groupthink. Artificial intelligence systems can “be a source of ‘cognitive pollution,’ a distortion of reality by partially or completely false narratives, believed and broadcast as if they were true,” the pontiff argues in his 2024 Message for the World Day of Social Communications. The digital revolution can imprison people “in models that nowadays are called ‘echo chambers,’” the pope states, and rather than increasing a “pluralism of information,” they create confusion.