Samaritans, the charity that supports anyone in distress, is launching a Twitter app to help people spot the signs that a friend is struggling to cope. Jam created the app, which uses Twitter’s application programme interface to pick out key words and phrases from Tweets that indicate a person is contemplating suicide. Samaritans then offers the user advice on how to help. Twitter is supporting the Radar app as part of its Twitter Ads For Good, which offers charities free Promoted Tweets. The campaign was created by James Greening, Joel Lim and Liam Chapman.