The Duke of Cambridge has accused social media giants of being "on the back foot" when it comes to tackling issues like fake news, privacy and cyber-bullying. In a hard-hitting speech Prince William said technology firms "still have a great deal to learn" about their responsibilities and he challenged them to fight harder against poison spread online. He was speaking during a visit to the BBC with his wife Kate to view the work the broadcaster is doing as a member of his Taskforce on the Prevention of Cyberbullying. Report by Blairm. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn