This is why President Trump's Minneapolis tweet was hidden - and what he said

Donald Trump has signed an executive order revising a US law that protects social media platforms from being responsible for content posted by their users.

The move comes after Trump threatened to "strongly regulate" or shut down platforms in a row over conservative censorship.

Here’s everything you need to know about it:

What does Trump’s order do?

The executive order challenges the liability protections which have allowed unfettered speech on the internet.

Under a 1996 law, website operators like Twitter, Facebook and Google cannot generally be held responsible for content posted by users.

The sites are also protected from lawsuits if they block posts deemed obscene, violent "or otherwise objectionable, whether or not such material is constitutionally protected".

Trump’s order argues this immunity should no longer apply if a social network edits posts, such as by adding a warning or a label.

It also says "deceptive" blocking, including removing a post for reasons other than those described in a website's terms of service, should not be protected.

Why has Trump done this?

Trumps’s order comes at the end of a week in which Twitter added a fact-check label to the President’s Tweets for the first time.

The platform added the warning to two of Trump's Tweets, in which he railed against the use proposed use of mail-in ballots in America's upcoming 2020 election.

"There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent," Tweeted the President.

"Mail boxes will be robbed, ballots will be forged & even illegally printed out & fraudulently signed."

Under his posts, Twitter offered users the chance to "get the facts about mail-in ballots".

Twitter say Trump "falsely claimed that mail-in ballots would lead to 'a Rigged Election.'

"However, fact-checkers say there is no evidence that mail-in ballots are linked to voter fraud."