Introduction Informational socializing of modern adolescents influences the form of communication as the main source of development and self-determination as the major developmental factor in adolescence. The investigation of links between personal features and moral values and Internet involvement allows defining the problem of correlations between personal and cognitive component of development and prevent cyberbulling and communication on-line risks.

The Objective of the study is to investigate the correlation between basic attitude and moral values of adolescents and the productivity of cognitive processing of social information on the Internet. The hypothesis of the study is the assumption that adolescents with a positive attitude to the mediated world and a high level of moral values reveal greater productivity of cognitive methods of processing social information obtained on the Internet. One of the goals of the research was to identify the relationship between basic beliefs and the Internet addiction in adolescents.

Methods and sampling. The study used the following methods: 1. Basic Belief Scale by R. Yanoff-Bulman (Kalmykova, Padun, 2002); 2. Methods of diagnosing moral values "Fair-Care" (S. Molchanov, A. Podolsky); 3) the author's method of cognitive assessment of social information on the Internet, based on the Crick and Dodge model (Crick, Dodge, 1994); 4. Method of diagnosing Internet-dependent behavior by S.H.Chen. The population aged 13 to 18 years accounted 175 adolescents (49% males and (51% females).

Results. Three groups of adolescents were different in the nature of basic assumptions and the level of development of moral values optimists, pessimists, and ego-centered pessimists, and Internet addicted. Comparative analysis of the cognitive methods of processing social information on the Internet, as well as signs of Internet addiction was carried out.

Conclusions: The hypothesis that positive attitude to the mediated world and belief that they control life, a high level of moral values associated with more productive cognitive methods of processing social information on the Internet has received confirmation. A group of adolescents identified as “pessimists” (perception of the world as hostile, negative image of themselves, lack of confidence in the world and success, low level of moral values) reveal signs of Internet addiction in behaviour.