In 2011, Google introduced its social networking site, Google+. Even though Google+ is cleaner and more straightforward than its nearest competitor, Facebook, it still has trouble competing with Facebook because:
A) most people don't know about it.
B) Facebook has a monopoly on social networking.
C) everyone's already on Facebook.
D) the market is still contestable.

Question

Quizplus · Accepted Answer

The fact that "everyone's already on Facebook" means that most people have established their social networks and created a lot of content on Facebook, making it difficult for them to switch to a new platform like Google+. As a result, Facebook enjoys a strong network effect that makes it hard for any new entrants to compete.

In 2011, Google Introduced Its Social Networking Site, Google