The former US president Barack Obama has spoken against call-out culture. ‘I do get a sense sometimes now among certain young people … that the way of me making change is to be as judgmental as possible about other people and that’s enough.’ Obama said that achieving change was a much more difficult issue than simply using social media. ‘That is not activism, that is not bringing about change. If all you’re doing is casting stones, you are probably not going to get that far,’ the 44th US president said at the the Obama Foundation summit on Tuesday.