https://www.wired.com/story/fuel-filter-gun-silencer-ads-facebook-instagram/
Thousands of ads on Facebook and Instagram have promoted gun silencers disguised as car parts, despite the platforms' policies banning such content.
The ads often use videos and recycled text, and some have been linked to a network of hundreds of ecommerce websites.
The ATF has warned that legality depends on functionality, not labels, and that even incomplete parts intended for silencers are regulated under federal law.