An anonymous reader writes with this excerpt: "David Cameron has attacked Facebook as irresponsible for lifting a ban on videos of beheadings being posted on its site. The prime minister said the social network must explain its decision to allow images showing decapitations to worried parents. Facebook has said users should be free to view such videos and then condemn the content. Cameron wrote on Twitter: 'It's irresponsible of Facebook to post beheading videos, especially without a warning. They must explain their actions to worried parents.' Facebook introduced a temporary ban on such videos in May but has since decided to remove the block on the grounds that the site is used to share information about world events, such as acts of terrorism and human rights abuses."