Who knows what other research they're doing. [fact]
Fiske acknowledged that she had been persuaded by Facebook's argument that the experimental manipulation was an unremarkable extension of the corporation's standard practice of manipulating people's news feeds. As Fiske recounted, "They said… that Facebook apparently manipulates people's News Feeds all the time.… Who knows what other research they're doing." In other words, Fiske recognized that the experiment was merely an extension of Facebook's standard practices of behavioral modification, which already flourish without sanction.
Shoshana Zuboff, The Age of Surveillance Cap…, loc. 949