Disinformation has become a global problem affecting citizens, governments and businesses. Identifying and isolating so-called "fake news" poses a major challenge across today's growing digital information ecosystem. But advances in artificial intelligence (AI) could increasingly help online information users sort out fact from fiction. The Global Disinformation Index (GDI) collects data on how misinformation – or disinformation, when deliberate – travels and spreads. The index, put out by a US-based non-profit organization, can help governments, media professionals, and other web users assess the trustworthiness of online content.