The Big Tech Funding browser extension allows Twitter users to see disclosures under the tweets of users who are affiliated with think tanks, academic centers, and advocacy groups that are funded by Big Tech (e.g. Google, Amazon, Apple, and Facebook.) The extension relies on publicly-available data sources, compiled by staff at American Principles Project, including company funding disclosures, nonprofit annual reports, IRS documents, and news stories. The information is available in aggregate at BigTechFunding.org.