The use of social media as a learning tool will be ineffective in a company that 1) has geographically dispersed employees 2) requires substantial teamwork 3) requires centralized decision making 4) has a significant number of millennials

3) requires centralized decision making

Explanation:

According to my research on the effects of social media, I can say that based on the information provided within the question it will be ineffective in a company that requires centralized decision making. This is because the decisions are all made at the executive level of the company and they usually just look at statistical profit values.

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3rd the reason why is because of management and leadership