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2. RESEARCH METHODOLOGY Since Facebook has become a trend that is folowed by all younger and older people around the world aim of this study was to measure the users habits, their behavior on Facebook and characteristics of their character. 2.1. Defining the problem The problem which needs to be examined is importance of social networks like Facebook to the users, and what is the main reason for opening the profile. It is necessary to investigate which personal information users leave on their profiles and how they can assist in determining an individual's lifestyle. Certainly it cannot be ignored the number of friends, number of photos as well as their content. These are all important sources of information requested. 2.2. Designing the research instruments The research will be conducted on a random basis and will last 3 weeks. It is assumed that respondents spend enough time on the Internet, especially on Facebook and will be able to fill out the online questionnaire. Therefore, for the research instrument it will be used poll. The poll will have seventeen questions that are related to the habits on the social network and three demographic questions, 2.3. Participants This study involved 40 participants (23 - female, 17-male). The largest percentage of respondents (45%) are in the age group between 25 and 30 years, 33% had between 20 and 25 years, 3% (.e, only one respondent) aged between 15 and 20 years. Only 15% of respondents aged between 30 and 40 years and 5% over 40 years. The largest proportion of respondents is from Belgrade, several from Novi Sad, Pirot, Pancevo, Smederevo, Krusevac and Uzice. They are all users of Facebook social network and they accessed online poll through their Facebook accounts. Dette 00000 An Figure 1: Research methodology . . 3. ANALYSIS OF RESULTS Based on the results, the author of this paper has made a classification of participants and divided them into four groups Facebook addicts - users whosee Facebook as an important source of information, and way of communicating with even strangers. These are also users who often share their photos, and which every aspect of the "offline" life trying to share with their online friends Facebook trend followers - users who access to Facebook because their friends follow this trend. To them Facebook is not very important as a social network, but as aninstrument of following the trend. Curious Facebook users - these are the most frequent users who are, unlike the previous group, interested in the social network itself, for its functionality, as well as to follow the activities of their Facebook friends Sociable Facebook users - these are mostly the users which meet new friends on various places and who are constantly expanding their circle of friends. They have friends abroad and use Facebook as a way to communicate with physically distant friends, sharing photos with them, videos, and so on. They use a check-in option whenever they find themselves in a new, interesting place. . POR SO 66