2.1 Power of Social Network

According to Karen (2011), a large or speedily growing user population characterizes a successful social network. The most popular social networks grow their membership through viral marketing. The natural human behaviors that causes people to tell others about products or services that are particularly good or bad. The value proposition is that the user must see enough return on investment of some measure of involvement. the examples will time, energy, or money, which is to continue using the service over a long time. Table 1 has listed some currently popular social networking websites. The service provider must see sufficient return on its investment such as staff, equipment, advertising, and website maintenance to continue to provide a stable service to its users. ‘Successful’ is not necessarily synonymous with ‘profitable’. While many social-network sites are (or at least hope to be) profitable, others, such as Wikipedia, the free online encyclopedia, are socially motivated, not-for-profit ventures. Wikipedia, funded entirely by donations, seeks to serve society by making the vast store of human knowledge available to everyone, for free, in the world’s most common languages. So, the power of social networking is really cannot be under estimated because the network is linked widely.