Some 689,003 lucky Facebook users were unwittingly part of an experiment in which their news feed was altered to make it more or less positive. Was this ethical?![](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tqmvZcw1THznELuNhFTyWD9-urGNwgDKR5EgDtwcoBa9UphWPjkI2GIFp8xhwX6z4c_lm-69tGQg=s0-d)
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