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Actors engaged in election disinformation are using online advertising platforms to spread political messages. In response to this threat, online advertising networks have started making political advertising on their platforms more transparent in order to enable third parties to detect malicious advertisers. We present a set of methodologies and perform a security analysis of Facebook's U.S. Ad Library, which is their political advertising transparency product. Unfortunately, we find thatdoi:10.1109/sp40000.2020.00084 dblp:conf/sp/EdelsonLM20 fatcat:iuobuxs7gfdb3etqehyl22hg5m