measuring the impact of social media strategies focus on paid 1

Write a 4 pages paper about how to measure the impact of PAID social media strategies. Covering following questions:

How many types of social media strategy? What are they?

Among of them, which one using money to run? (PAID STRATEGY?)

How does those paid strategy operate?

How to measure the impact of those PAID STRATEGY?

(FOCUS ONLY IN PAID STRATEGIES, Go straight to the point, do not running around)