YouTube has pledged to ban all videos that promote or provide links to websites selling firearms.
Doing so sees the site, owned by Google, taking a clear stance on the gun control debate in the wake of the Parkland shooting, when expelled student Nikolas Cruz, 19, returned to his old high school in Florida on Valentine's Day and shot dead 17 of his former classmates, injuring 17 more.
That atrocity inspired surviving pupils from the Marjory Stoneman Douglas school to appeal for tighter gun ownership laws, an issue that has divided America, with many continuing to insist on their Second Amendment right to bear arms despite the high frequency with which mass shootings occur in the US.
In addition, YouTube will remove all videos selling weapon accessories, including bump stocks for semi-automatic rifles, the modifier used by Stephen Paddock in the Las Vegas massacre on 1 October last year, which saw him kill 58 people and injure a further 851 after firing into a crowd from the balcony of his hotel suite during a country music festival.
"We routinely make updates and adjustments to our enforcement guidelines across all of our policies," a YouTube spokeswoman said.