Facebook Ads Monitor: An Independent Auditing System for Political Ads on Facebook

• URL: http://arxiv.org/abs/2001.10581v2
• Date: Fri, 31 Jan 2020 13:26:33 GMT
• Title: Facebook Ads Monitor: An Independent Auditing System for Political Ads on Facebook
• Authors: M\'arcio Silva, Lucas Santos de Oliveira, Athanasios Andreou, Pedro Olmo Vaz de Melo, Oana Goga and Fabr\'icio Benevenuto
• Abstract summary: We designed and deployed an independent auditing system to monitor political ads on Facebook in Brazil. To do that, we first adapted a browser plugin to gather ads from the timeline of volunteers using Facebook. Then, we use a Convolution Neural Network (CNN) to detect political Facebook ads using word embeddings.
• Score: 1.2070251470948772
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The 2016 United States presidential election was marked by the abuse of targeted advertising on Facebook. Concerned with the risk of the same kind of abuse to happen in the 2018 Brazilian elections, we designed and deployed an independent auditing system to monitor political ads on Facebook in Brazil. To do that we first adapted a browser plugin to gather ads from the timeline of volunteers using Facebook. We managed to convince more than 2000 volunteers to help our project and install our tool. Then, we use a Convolution Neural Network (CNN) to detect political Facebook ads using word embeddings. To evaluate our approach, we manually label a data collection of 10k ads as political or non-political and then we provide an in-depth evaluation of proposed approach for identifying political ads by comparing it with classic supervised machine learning methods. Finally, we deployed a real system that shows the ads identified as related to politics. We noticed that not all political ads we detected were present in the Facebook Ad Library for political ads. Our results emphasize the importance of enforcement mechanisms for declaring political ads and the need for independent auditing platforms.

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