Facebook's ad library is so plagued by bugs and technical constraints that researchers say it is effectively useless to adequately track political advertising (Matthew Rosenberg/New York Times)
Matthew Rosenberg / New York Times: Facebook’s ad library is so plagued by bugs and technical constraints that researchers say it is effectively useless to adequately track political advertising — The social network’s new ad library is so flawed, researchers say, that it is effectively useless as a way to track political messaging. Facebook's ad
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