From vnunet:

Facebook has refused to host ads from a US millionaire promoting gun training and offering $3m worth of free handguns.

Dr Ignatius Piazza, founder and director of Front Sight Firearms Training Institute, had submitted pay-per-click ads on Facebook offering a four-day handgun training course and a one-day concealed weapon permit course.

…

Piazza said that he was left “stunned” when Facebook rejected his ad on the ground that it violated Point 6 of the social networking site’s advertising guidelines.

“Provocative images will not be accepted. Ads may not contain, facilitate or promote adult content, including nudity, sexual terms and/or images of people in positions or activities that are excessively suggestive or sexual,” Facebook’s Point 6 states.

More here.