FB activated its safety check feature for users after the a suicide attack at Istanbul’s Ataturk Airport. The bombing dominated social media on Tuesday, with #Istanbul trending worldwide on Twitter, along with #terorelanetolsun and Ataturk Havalimani’nda (‘at Ataturk airport’ in Turkish). #PrayforTurkey was also trending. The feature allows people to notify their friends if they are in the affected area and mark themselves as safe. A click or tap on the “I’m Safe” button lets friends and loved ones know straight away. Users can also check to see whether their friends are safe too.