Recent innovations and advances in information and communication technologies (ICTs) have resulted into radical changes in the way information resources are provided, and have also brought about several options to handle a wide-range of information services effortlessly. Web 2.0 or social media is one of these innovations which expands the option in information services provision. Against this backdrop, this study intended to investigate the use of Web 2.0 technologies in the public libraries in the Mangaung Metropolitan Municipality in South Africa. The study was guided by mixed-methods of quantitative and qualitative approaches, because the approach enables the researcher to cover a wide variety of issues. The study adopted a sample survey research design to guide selection of subjects. Two data collection tools namely: a self-administered questionnaire were used for collecting data from 248 library users, while unstructured interview schedules were used to collect qualitative data from 16 library officials. The response rate for the survey of library users was 69%, a good rate for an unsolicited survey. The findings revealed that Mangaung Metropolitan Municipality libraries have ICT equipment with access to Web 2.0 technologies and that these technologies are also highly utilised. However, lack of training, low bandwidth, and short time allowed to access WIFI makes it difficult for the library users and staff to fully benefit from the web-based services offered by these libraries. Other factors include poor staff attitudes, technical problems, and challenges in marketing of online public access and catalogue, restrictions of social networking sites, non-linkage of the library OPAC to social media, geographical distances, and load shedding. The study concluded by recommending allocation of sufficient funds to cater for ICT trainings, free WIFI, uninterrupted power supply, increased bandwidth, amongst others which will enhance the quick and effective service that will meet the information needs of their users. / Information Science / M.A. (Information Science)