Considering what you have learned about ethics in research this week, what ethical issues are raised by this Facebook study? What consent issues were present in this Facebook study? Could there have been any issues with regards to vulnerable populations in this study? How would you feel if you found out that you were unknowingly part of this Facebook study? Finally, considering the hypothesis of the study that more negative content would lead to more negative posts and vice versa, could Facebook have addressed this hypothesis without manipulating the news feed content of these 700,000 Facebook users?