• Ad Observatory

    See our analysis of Facebook advertising, and search for messaging trends, microtargeting, views by state, and more!

  • Ad Observer

    Help out by contributing your Facebook and YouTube ads by installing the Ad Observer plug-in tool.

Research Articles

Data sets

  • AdObserver Data

    Public dataset of political ads observed by users of our browser extension.

  • Facebook Ad Library Data

    Public dataset of ads we have collected from Facebook’s Ad Library for the US, Canada, and the UK. Access is limited to verified academic researchers and journalists who have access to Facebook’s Ad Library API, and managed by Harmony Labs.

  • Facebook Transparency Reports

    Public dataset of historical transparency reports published by Facebook.


  • Github

    Open-source code for Ad Observatory, our analysis and data collection.

Tutorial Videos