On Wednesday, Twitter prevented people from posting links to a New York Post story, warning those trying to click it that the link was “potentially unsafe”.
Facebook also took action, limiting the report’s distribution in its news feed.
It said it had done this as part of a “standard process” to give third-party fact-checkers time to review the content and decide if it should be treated as misinformation.
Jack Dorsey, Twitter’s chief executive, acknowledged that it should have informed users as to why it had intervened sooner.
“Our communication around our actions on the @nypost article was not great. And blocking URL [website link] sharing via tweet or DM [direct message] with zero context as to why we’re blocking: unacceptable,” he tweeted.
The New York Post article contained screenshots of emails allegedly sent and received by Hunter Biden, Joe Biden’s son.
The article focused on an email from April 2015, in which an adviser from a Ukrainian energy company apparently thanked Hunter Biden for inviting him to meet Joe Biden in Washington.