Social networking sites (SNSs) are the major technological developments included under the umbrella of Web 2.0. College students are the most frequent users among the billion of active SNSs participants. Despite the many advantages that derived from active participation in SNSs, numerous security, privacy and trust concerns seem to influence social interactions and communications within it. The purpose of this quantitative research study was to determine the impact of security, privacy, and trust concerns on members' behaviour towards sharing their information and develop new relationships using a survey method in the form of a questionnaire. Furthermore, this study examined the effects of the relationships developments between students on the prospective students' enrollment and potential employees' application in Malaysian higher education institutions (HEIs). The findings of the study showed that perceived privacy and security are still to be the slight concerns for online SNSs' users' willingness to share their information. However, members' perceived security, trust in SNSs and its members positively associated with development of new relationships, which is positively associated with students' enrollment and employees' application in HEIs. The findings provided descriptive, reliability, factors loading, correlations as well as regression analyses for perspectives, using SPSS 12.0. Copyright © 2014 Inderscience Enterprises Ltd.