Social media websites, which facilitate the generation and exchange of user-generated contents, has been touted to offer unprecedented opportunities to gather people and convert segmented viewpoints into value co-creation commercial opportunities. Particularly, companies are fast sensing the opportunities and threats brought about by the opinions on products or services on these social media websites while governments are wary of the various political voices which might not be easily regulated and managed. The fundamental objective of this special issue is to assimilate the best practices and insights from academic and industry researches to understand how social media could be appropriated for varying business purposes within and beyond the boundary of an organization. Four articles relating to this topic are printed in this special issue. We hope, through the four articles, we are able to engage in a deeper dialog to identify the psychological and behavioral responses to information and messages conveyed through the social media websites and to understand the commercial, political, social impacts of social media.