A social network service is one of the most prospering social media in the Web 2.0 era. In SNSs, a massive number of people make online friends and share their interests. In May 2007, Facebook made an announcement of "Open API" policy, which allows a third-party to create applications in Facebook. After "Open API," users of Facebook can utilize various interactions other than just messaging. This led to radical increase in user growth of Facebook and threatened Myspace, which was the top SNS at that time. This innovative move gathered an interest of how "Open API" affects interactions in social networks. The main objective of our research is to analyze the relationship between the growth of social network adoption and network topology. For this issue, our study conducts both analytical and empirical models. First of all, we adopt the concept of Metcalfe's and Reed's law to model the growth pattern of social network under duopoly competition of two SNSs. Then we apply the growth functions to the empirical analysis. We collect web traffic data of Facebook and Myspace from Alexa and test the structural change after the adoption of "Open API" policy. The result of the analytical model shows that social network adoption follows a quadratic growth under Metcalfe's law and an exponential growth under Reed's law. The result also shows the conditions for a SNS to take all new adopters in the market. If the SNS follows Reed's law, it can absorb all new adopters even if that particular SNS is a newcomer in the market. The empirical result confirms that there exists a significant difference in the growth pattern between, before and after "Open API." This implies that "Open API" transformed Facebook one-to-one communication network into a group forming network. Eventually, this transition increases potential connectivity in social network and leads to exponential growth of social network adoption.
With the emergence of indirect procurement, it has become a global trend for companies to outsource their maintenance, repair, and operating (MRO) supplies to procurement service providers (PSPs). Due to the variety of MRO items, evaluation of numerous suppliers in various industries is a particularly complex task for PSPs. Due to this complexity, many PSPs still evaluate and select suppliers based on the sourcing managers' subjective knowledge. Through the case of adopting a supplier evaluation system, this research is to find the managerial issues organizations should consider when they transform sourcing managers' knowledge into the system. We interpret the issues based on the Technology-OrganizationEnvironment (TOE) framework. This case conclusively shows the importance of positive feedback loop between the users and the information system for the performance improvement of the system.
With growth in mobile Internet services, the relationship between mobile and fixed broadband has become an issue in telecom firm strategy. Previous research focused on aggregate penetration for mobile and fixed broadband services. Our research analyzes the economic relationship between mobile and fixed broadband services at the household level, as a basis for how senior managers should rethink their strategy approach. Using data on broadband services subscriptions, we examine how changes that occur for mobile broadband services bandwidth (MBB) affect changes in fixed broadband bandwidth (FBB) services subscriptions, inclusive of new subscriptions -and vice versa. We explore the different cross-effects and asymmetric patterns of event-driven bandwidth changes. Mobile and fixed broadband services are complementary: both affect the consumption of the other. Our findings offer useful information for marketing strategy and broadband services promotion, such as bundling strategy based on bandwidth changes, and segmentation based on the bandwidth changes in both services.
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