4. This article is to do with a study conducted by researchers to determine whether the content Facebook users see on their timelines affect their emotions when posting on social media. The feeds on people’s timelines were manipulated and researchers found that people who saw more positive feeds then wrote more positive feeds, and people who saw negative feeds then wrote more negative posts, thus determining that moods were contagious on social media platforms.  5. The results demonstrates causation. It is causation because the researchers who conducted this experiment determined that when users saw more feeds with positive words they responded positively in their posts, and those who saw more negative posts responded negatively. This shows that there is contagious emotions in non verbal social media posts. It could not be a coincidence because the test was done randomly in a controlled setting and people reacted the same way. There was a direct relationship between the posts and how the users reacted to it.  6. If this research was conducted by psychologists then it was not done in an ethical manner because the researcher should not have conducted the research with a simple acceptance of the terms and conditions of joining Facebook. Participants should have been given more information about the research as well as how the research would have been beneficial to society. Participants should have been given the option to refuse being part of the research. Participants should have been given fair warning that stated what was the objective of the research and that their Facebook feeds would have been altered. After the research was done, the participants should have been able to talk to the researchers about the findings. The participants should not have been deceived without any warning and they should have been able to ask the researchers questions if they had any.      Citations: Ethical Principles of Psychologists and Code of Conduct. (2017, January 1). Retrieved from http://www.apa.org/ethics/code/Goel, V. (2014, June 29). Facebook Tinkers With Users’ Emotions in News Feed Experiment, Stirring Outcry. Retrieved from https://www.nytimes.com/2014/06/30/technology/facebook-tinkers-with-users-emotions-in-news-feed-experiment-stirring-outcry.html?_r=0Kramer, A. (2014, June 2). Editorial Expression of Concern and Correction. Retrieved from http://www.pnas.org/content/111/24/8788.full.pdfSmeets, I. (2012, November 5). The danger of mixing up causality and correlation: Ionica Smeets at TEDxDelft. Retrieved from http://www.youtube.com/watch?v=8B271L3NtAw