Answer:
D. Harvard "Tastes, Ties, and Time (t-3)" study (2006-2009)" study
Explanation:
In 2006, Harvard conduct a (t-3) study that gains popularity. It was a Face-book study that plays with your emotions. This study doesn't share the mood manipulation which unsettled many of the users. It is a good example of social data is always murky and study themselves is completely creepy. In this study, the researcher collects the data without informed consent of objects throughout the data verse network.