Journalism

I collaborate with journalists and engineers to design tools and develop crowdsourced datasets for investigating social media platforms.





Investigation finding that tax filing services such as H&R Block, TaxAct, and TaxSlayer have been  transmitting sensitive financial information to Facebook when Americans file their taxes online.




TitleTax Filing Websites Have Been Sending Users’ Financial Information to Facebook
Authors Simon Fondrie-Teitler, Angie Waller, and Colin Lecher
Published11/22/2022
URL Read at The Markup︎︎︎
Awards: Society for Advancing Business Editing and Writing’s 2022 Best in Business Awards




A tracking tool installed on many hospitals’ websites has been collecting patients’ sensitive health information—including details about their medical conditions, prescriptions, and doctor’s appointments—and sending it to Facebook.




TitleFacebook Is Receiving Sensitive Medical Information from Hospital Websites
Authors Todd Feathers, Simon Fondrie-Teitler, Angie Waller, and Surya Mattu
Published11/22/2022
URL Read at The Markup︎︎︎
Awards 2023 Digiday Media Awards–Best Story




Investigation into why Facebook was unsuccessful in eliminating ad targeting based on proxies for race, religion, health conditions, politics, or sexual orientation.



TitleFacebook Promised to Remove ‘Sensitive’ Ads. Here’s What It Left Behind
Authors Angie Waller and Colin Lecher
Published11/22/2022
URL Read at The Markup︎︎︎
DATA https://github.com/the-markup/facebook-removed-interests



Ahead of the national vote in Germany in the 2022 elections, data from Citizen Browser reveals that posts promoting the AfD party appeared on Facebook feeds more than three times as frequently as those promoting other parties.





TitleGermany’s Far-Right Political Party, the AfD, Is Dominating Facebook This Election
AuthorsAngie Waller and Colin Lecher
Published11/22/2022
URL Read at The Markup︎︎︎
Read at Süddeutsche Zeitung︎︎︎
DATA https://github.com/the-markup/citizen-browser-political-groups-germany/