In a report by the Simon Wiesenthal Center, Twitter has received the 'F' grade for being most influential in promoting hate and terror on the social media front, reports Washington Post.
Social media websites have come under the scanner for having violent or terror spewing content. On the microblogging site Twitter most of the content is posted without getting screened. It can neither be removed from the site without the user removing it personally.
According to reports, terrorist groups like Al-Shabab, Somali Islamic extremist militia linked to Al- Qaeda and the Taliban have their own Twitter feeds.
On the other hand, social media site Facebook scores 'A' minus as it has a stricter policy to track and remove content promoting terror or violence.
YouTube scored 'C minus' as its guidelines prohibit promotion of elements related to hate or terror such as bomb making, community violence or hate speech but it still requires improvement, the reports said.