This post was updated at 10:30 a.m. ET on March 6.
Facebook said Wednesday that it will limit minors' access to pages and posts that offer firearms for sale, along with other measures intended to curtail illegal gun trafficking.
"This is something we've been working on for a while," says Facebook spokesman Matt Steinfeld. "We want to balance the interests of people who come here to express themselves while promoting an environment that is safe and respectful."