Yazidi women and girls as young as 12 are being advertised for sale as sex slaves by Isis fighters on the instant messenger apps Whatsapp and Telegram.The apps have also been used to share databases of photographs so that the women can be identified at checkpoints if they try to escape Isis-controlled territory.
http://www.independent.co.uk/news/world/middle-east/isis-using-whatsapp-telegram-sell-sex-slaves-iraq-facebook-a7125551.html