From Yahoo News:

Under pressure from gun safety advocates, the social network will block members under 18 years of age from viewing pages or timeline posts reported to involve private sales of firearms and will set up online “checkpoints” warning people that such deals may be illegal.

And people offering guns for sale on Facebook will not be allowed to indicate that background checks are not required or that sales will be done across state lines without involving licensed firearms dealers, it said.

The world is safe again.