The paper discusses the impact of modern technologies, especially the internet, on the functioning of young people. The following thesis was formulated: usage of modern technologies have both a negative and positive influence on cognitive processes. The internet is taking educational functions, that were to date reserved to the family and school. It is a great challenge for the society and scientific reflection. For a positive educational influence of the internet to happen, it is necessary to take into account in teaching and educating the development of metacognitive knowledge and skills.