The researcher’s failure to protect research subjects from deductive disclosure is the primary ethical violation in which of the following studies?

The researcher’s failure to protect research subjects from deductive disclosure is the primary ethical violation in "Harvard “Tastes, Ties, and Time (T3)” study (2006-2009)." Sociologists at Harvard University gleaned voluminous and detailed personal information from the Facebook profiles of an entire class of undergraduates and followed those students over four years. 

The last sentence of the gettysberg address