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Facebook uses algorithmic curation---automated selection and ranking of content---to present a personalized News Feed to each user for consumption. However, the News Feed user interface provides little information to help users understand how the ranking algorithm works. We analyzed the company's "News Feed FYI' blog series to better understand the degree to which Facebook employs "how'and "why' explanations of its News Feed algorithm. These types of explanations have been used in other recommendation and intelligent systems as a means of promoting user understanding and acceptance. Our findings show that the "News Feed" FYI' blog posts focus more on explanations that justify why the algorithm works the way it does, and less on explanations that describe how the system works. These findings suggest that the "News Feed" FYI' series would be more helpful for increasing users' confidence in …