Facebook, the World's Most Visited Web Site as of June

Multiple Choice

Facebook, the world's most visited Web site as of June 2011, has millions of users. The large membership base of Facebook would mean that a user is likely to find most of his friends when he logs in to Facebook. Lack of this competence prevents new players from penetrating Facebook's market. This is an example of ________.

A) monopolistic competition
B) internal marketing
C) network effects
D) guerilla marketing