World Communications Day, the only worldwide celebration called for by the Second Vatican Council (“Inter Mirifica”, 1963), is marked in most countries, on the recommendation of the bishops of the world, on the Sunday before Pentecost, which in 2018 will fall on May 13. In some countries, the day is marked as the solemnity of Ascension.
Pope Francis announced the theme for World Communications Day on Twitter on 29 September last, the feast of the Archangels Michael, Raphael and Gabriel, with Gabriel being designated the patron saint of telecommunications. Pope Francis will focus on the harmful effects of fake news against journalism for peace, in his message for peace for World Communications Day. This year’s theme is “’The truth will set you free’ (Jn 8:32). Fake news and journalism for peace.” More
https://www.catholicbishops.ie/2018/01/24/world-communications-day-2018/