The problem with which this investigation is concerned is that of determining the effects of videotaping and subsequent playback on the communication performance of introverted and extroverted individuals. The principal method of determining these effects is the subjective judgment of a panel of qualified speech instructors who viewed videotaped speeches made by the subjects. All subjects were repeatedly subjected to videotaping, and half were exposed to playback. Statistically, by using one-way analysis of covariance, the effects of playback were measured: The speaking scores achieved by the experimental introverts and extroverts were compared with the speaking scores of the control introverts and extroverts. Sixty-four subjects were used; these were limited to college students enrolled in the teacher-education program. To carry out the purposes of the study, the following hypotheses were tested: 1. There will be a significant difference between the scores of introverted trainees who are videotaped and exposed to playback and the scores of introverted trainees who are videotaped but not exposed to playback. 2. There will be a significant difference in the scores of extroverted trainees who are videotaped and exposed to playback and the scores of extroverted trainees who are videotaped but not exposed to playback.

Temperament is a determining factor of people's behaviour in everyday life. Does it show itself also online? Does introversial and extraversial behaviour in online networks differ? Some authors in their studies confirmed that introverts feel more secure in online networks and thus behave more like extraverts, similar effect have networks on behaviour of extraverts. Other authors proved empirically, that introversial users in virtual environment and online networks become more socially isolated and solitary. These studies were in principle conducted on American or Brittish colleges or universities, we have no similar research in Czech Republic. For this thesis, behaviour research and temperament identification questionnaire was filled up by 310 people of average age of 29 years, 2/3 were women, most of them live and work in Prague in media, marketing and public relations. Research results showed that 46% of users were present on Facebook for more than 2 years, extraverts actively participate in more networks, behaviour of introverts and extraverts on Facebook is really different as well as their way of using it, sometimes we can find very surprising details. First part of the thesis contains information about theoretical background - networks, social networks, online networks, ways and methods of...