Web social media presents challenging knowledge management issues at all levels – for individuals, organizations, communities, business, and governments. Knowledge management is the process of capturing, developing, sharing, and effectively using organisational knowledge. Web social media is different from traditional or industrial media in many ways, including quality, reach, frequency, usability, immediacy, and permanence. Such characteristics have made knowledge management on web social media more challenging than ever before. Breakthroughs need to be made on many technological bottlenecks, such as; i) how to gain the capability of dealing with an incredible volume of information; ii) how to overcome the difficulty of extracting relevant knowledge from the information deluge; iii) how to not only manage information but also make it productive; and iv) how to transit valuable information into business value. The challenges and potential benefits of knowledge management of web social media have attracted much attention from the researchers to make many great achievements in recent years.