Large language models reduce public knowledge sharing on online Q&A platforms 2024 article delriochanona2024stackoverflow Authors Del Rio-Chanona, R. Maria and Laurentsyeva, Nadzeya and Wachs, Johannes Venue PNAS Nexus URL https://academic.oup.com/pnasnexus/article/3/9/pgae400/7754871 DOI 10.1093/pnasnexus/pgae400