Mental health disorders and addictions affect no less than 40% of children and adolescents worldwide. One out of every ten youths is estimated to require intensive psychiatric treatment [1]. Mental disorders of the developmental period are an increasingly growing phenomenon. According to WHO, neuro-psychiatric disorders are to be the first of the 5 leading medical conditions, causes of death and disability among children in 2020 [2]. Previously observed in other countries and cultural contexts, these trends are increasingly reflected not only in Poland and Europe, but also in various Asian and American regions. The problem of addiction to social media is discussed in the first article entitled Comorbidity of social media addiction and other mental disorders - an overview, by Krzysztof Szczygieł.