XXI International specialized exhibition “Mass Media in Belarus” opened today in Minsk. President of Belarus sent his letter of greetings to the participants, guests and organizers of the forum. About a hundred booths represent informational agencies, editorial offices, media publishing houses. Mass media of the People's Republic of China are a special guest. One of the central events today was a conference “Mass Media in the changing world: professionalism and responsibility”. It was dedicated to the issues of informational security. On May, 5, a ceremonial awarding of the winners of the National competition among printed media “The Golden Letter” will be held.