13 All the children of the Church should join, without delay and with the greatest effort in a common work to make effective use of the media of social communication in various apostolic endeavors, as circumstances and conditions demand. They should anticipate harmful developments, especially in regions where more urgent efforts to advance morality and religion are needed. Pastors should hasten, therefore, to fulfill their duty in this respect, one which is intimately linked with their ordinary preaching responsibility. The laity, too, who have something to do with the use of these media, should endeavor to bear witness to Christ, first of all by carrying out their individual duties or office expertly and with an apostolic spirit, and, further, by being of direct help in the pastoral activity of the Church-to the best of their ability-through their technical, economic, cultural and artistic talents.
Source: Inter Mirifica (Vatican.va)