When he was a student at Brigham Young University three years ago, Anthony Willey came across a Wikipedia page on Mormons. What he read filled him with frustration.

VATICAN CITY - The co-founder of Wikipedia told a Vatican audience that his online encyclopedia could contribute to peace by promoting "a more thoughtful world," even as the site was under fire for how it referred to those who oppose and support legalized abortion.

Jimmy Wales, who co-founded Wikipedia in 2001, was invited to address the annual assembly of the Pontifical Academy of Social Sciences. The meeting at the Vatican April 27-May 1 focused on Blessed John XXIII's 1963 encyclical "Pacem in Terris" and continuing challenges to promoting peace and justice in the world.