A six-week campaign to pressure Facebook into pulling its gun advertisements has paid off. The social media giant announced Wednesday that it will monitor and restrict some gun advertisements on its pages. The effort was spearheaded by Moms Demand Action and Mayors Against Illegal Guns, two of the most prominent gun violence prevention organizations, and supported by CeaseFirePA.

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Facebook will continue to allow guns to be sold through its pages, but it will remove posts in which sellers specifically advertise that they will not conduct a background check or that they will sell across state lines. In addition, registered users who are younger than 18 will be blocked from viewing gun ads.

“We are happy these companies listened to American mothers,” said Moms Demand Action founder Shannon Watts. “And we believe these changes are a major step toward making sure people who buy or sell guns on their platforms know the law, and follow it.”