A$1.$ Identify the reinforcing feedbacks responsible for the exponential growth of the number

of active Facebook users, shown below $($data from Facebook$).$

Develop a causal loop diagram capturing the most important reinforcing feedbacks you

believe to be responsible for the astounding growth of Facebook. Limit yourself to no

more than four reinforcing feedbacks. In your writeup, provide a one$-$sentence

explanation of each loop.

Facebook Active Users

A$2.$ No real quantity can grow forever. Identify some of the balancing feedbacks that might

eventually stop the growth of Facebook. Add them to your causal diagram. Limit yourself

to no more than four balancing feedbacks. Provide a one$-$sentence explanation of each

loop.

A$3.$ What is likely to happen to the number of Facebook users in the future? Specifically, use

your diagram to suggest what the pattern of development for active Facebook users might

be in the future. Draw a graph showing possible futures for the number of active users.

Select an appropriate time horizon, and explain your choice briefly. Limit yourself to no

more than three possible future paths for subscribers. Name your scenarios.

Use the feedback structure and other features of your causal diagram $($such as delays$)$

to assess what the likely behavior of the user base might be$.$ Chapter $4$ discusses

different feedback structures and the various patterns of behavior they can generate.

A good answer here will explain how the structure you hypothesize generates the

behavior you anticipate.