DAVID Cameron and Barack Obama were caught posing for a mobile phone "selfie" at Nelson Mandela's memorial service.

The two men were sitting on either side of Danish Prime Minister Helle Thorning-Schmidt and smiled as she took the snapshot of the three leaders at the FNB Stadium in Soweto. The image of the US President, British Prime Minister and Danish leader went viral on the internet - and led to a backlash from Twitter users who said it was inappropriate behaviour at an event remembering the life of the anti-apartheid hero.