Nearly three-quarters of U.S. adult Facebook users say they did not know that the platform maintains a list of their traits and interests for advertisers. About half of Facebook users say they are not comfortable when they see how the platform categorizes them, and 27% maintain the site’s classifications do not accurately represent them.
Facebook Algorithms and Personal Data
from Pew Internet http://pewinternet.tumblr.com/post/182321348078
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