ABSTRACT. This study aims to investigate how university students' information literacy self-efficacy perception is influenced by their Facebook and Wikipedia literacy levels, school year, gender, second language level and weekly Internet usage duration by using decision tree method. The researchers purposefully collected data from 2776 students from 11 faculties of Dokuz Eylul University. The first part of the data collection instrument included questions about university students' characteristics such as Wikipedia and Facebook literacy levels, school year, gender, second language level and weekly Internet usage duration. The second part was related to information literacy self-efficacy. The most important result of the study was that Facebook and Wikipedia literacy rather than university students' other characteristics were the first rank independent variables explaining information literacy self-efficacy. In addition, female students whose Wikipedia literacy level was at an advanced level were 16.4% of the sample and these students had the highest information literacy selfefficacy perception among the sample. Keywords. Information Literacy, self-efficacy, Facebook, Wikipedia, university students, classification and decision tree.
SUMMARYPurpose and Significance: Almost all university students in both Turkey and the world use Facebook and Wikipedia to make new friends, find previous friends, share daily life experiences and reach current information announced by instructors and peers from their university. University instructors also use these social media in education to deliver course materials among students, announce course specifications, and help to teach how students can reach up-date information. However, the results of academic use of social media showed that social media usage may cause unexpected negative results among students such as cyber bullying, problems related to privacy and inappropriate behaviors. All these considerations require researchers to conduct more studies on this field. Although the literature indicated the high relationship between social media and information science, researches in this field is still not sufficient. The current study aims to investigate how university students' information literacy self-efficacy is influenced by their Facebook and Wikipedia literacy levels, school year, gender, second language level and weekly Internet usage by using decision tree method.