Washington, May 29 -- The United States (US) President Donald Trump is expected to sign an executive order later Thursday that would roll back immunity enjoyed by social media platforms such as Twitter, YouTube and Facebook for content posted on their websites, according to multiple US media reports.

"This will be a Big Day for Social Media and FAIRNESS!" the president wrote in a tweet Thursday, reconfirming a White House announcement from Wednesday of the upcoming order. But he shared no details.

The order is chiefly expected to allow federal regulators to rethink a law - Section 230 of the Communications Decency Act from 1998 - that absolves social media platforms of all responsibility or accountability for content posted on their websi...