Ad Tool Facebook Built to Fight Disinformation Doesn’t Work as Advertised - The New York Times

But instead of setting a new standard, Facebook appears to have fallen short. While ordinary users can look up individual ads without a problem, access to the library’s data is so plagued by bugs and technical constraints that it is effectively useless as a way to comprehensively track political advertising, according to independent researchers and two previously unreported studies on the archive’s reliability, one by the French government and the other by researchers at Mozilla, the maker of the Firefox web browser.