Was Facebook's Mood Study Too Creepy?

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According to Adrienne LaFrancesenior associate editor at The Atlantic, Facebook manipulating what you see on your newsfeed is nothing new, but users were outraged when a study was published that revealed Facebook manipulated what kinds of words they saw on their feeds - happy or sad - in an attempt to find out if it affected their moods later in the week. Was it legal? Ethical? Did it cross a line?