Facebook is reportedly removing posts that name the Trump impeachment whistleblower.
It follows right-wing publication Breitbart News claiming to have identified the person, Reuters reported Friday.
CNN added YouTube is following suit with any videos mentioning the whistleblower's name, with Google confirming the report to CNET.
The White House whistleblower had in September released a nine-page complaint alleging that senior officials had tried to "lock down" the details of US President Donald Trump's phone call over the summer with Ukraine's president.
During the phone call, Trump had asked Ukrainian leader Volodymyr Zelensky to investigate Democratic presidential candidate Joe Biden and his son.
The revelation led to an impeachment inquiry being launched.