Sophie Zhang is an American data scientist and whistleblower who formerly worked at the Facebook Site Integrity fake engagement team, created to deal with bot accounts, often controlled by authoritarian governments' entities.

[5] The British newspaper The Guardian dedicated a series, The Facebook Loophole, based on Zhang's resources and accounts, to report on these Facebook-based political manipulations.

[5] Facebook suppressed the message on the internal board, then contacted Zhang's web hosting service and domain registrar to request and force her private website offline.

Zhang has expressed support for another Facebook whistleblower, Frances Haugen,[15] who shared internal company documents with The Wall Street Journal and on October 5, 2021, testified before the United States Senate Commerce Committee's Sub-Committee on Consumer Protection, Product Safety, and Data Security.

[16] On October 12, 2021, Zhang told CNN she has shared documents about Facebook with a United States law enforcement agency, and that she is available to testify before Congress and is encouraged by the bipartisan support for congressional action after Haugen's testimony.

[17][18] On October 14, 2021, it was announced Zhang would testify before the British Parliament on October 18, 2021, about "her work as a data scientist for the Facebook Site Integrity fake engagement team, dealing with bot accounts, often operated by government backed agencies in countries such as Russia," according to Damian Collins, the chair of the British Parliament Online Safety Bill committee.