Facebook is blocking minors from seeing postings of gun sales and will take down sales that don't require a background check or cross state lines.
Until now, Facebook regulated only paid ads and sponsored stories, which could not promote weapons of any kind. Images of weapons are generally acceptable as long as the weapon is not pointed directly at the viewer. User posts could say almost anything.
The changes will extend to Instagram where someone searching for a hashtag related to gun sales will get a content advisory.