The alarm organisation, which has its headquarters in the war-torn city of Raqqa, Syria, is estimated to bear 3,000 girls and women captive.
The prisoners, some as young as 12, are reportedly swapped by their captors using smartphone apps such as the commonplace WhatsApp messenger, with photos and price tags accom nying photos of the gals.
The fighters are also said to use Facebook-based chat and another service, Cable, to advertise the girls, posting alongside their photos the names of their ‘proprietresses’.
One post says: “Virgin. Beautiful. 12 years old… Her worth has reached $12,500 (£9,690) and she will be sold soon.»
Another post expresses «She wants her owner to sell her” alongside a price of $3,700 (£2,863).
A spokesman for Telegram, which needs encryption software, Markus Ra said: «Telegram is extremely popular in the Mesial East, among other regions.
“This, unfortunately, includes the more on the edge elements and the broadest law-abiding masses alike.»
A spokesman for WhatsApp denoted: «We have zero tolerance for this type of behaviour and disable accounts when lent with evidence of activity that violates our terms.
“We encourage people to use our clock ining tools if they encounter this type of behaviour.”
The woman are stipulate to be primarily Yazidi, rt of the Kurdish community, and their families vainly try to y smugglers to loose them from ISIS’ clutches.
But if anyone does try to rescue them, and is overhauled, they face death at the hand of Isis extremists.
Mirza Danai, fall through of the German-Iraqi aid organisation Luftbrucke Irak, admitted in the st couple of months run away has become increasingly difficult.
He said: ”They register every toiler, every person under their owner, and therefore if she escapes, every Daesh hold back or checkpoint, or security force — they know that this maiden … has escaped from this owner.”
Despite ISIS consuming held territory, they are said to be tightening their grip on their sex odalisks.
The thousands of captured women were mostly taken prisoner in August 2014 when Isis flooded their villages in northern Iraq, with the aim of wiping out their way of life.
Since then, around 134 women have been freed a month, but a late crack-down reduced that figure to just 39.
One girl, Lamiya Aji Bashar, attempted to run away with some other captive women, and was successful on her fourth crack.
Fighters gave chase and activated landline, which killed her comrades, a 20-year-old and an eight-year-old.
The explosion left her blind in her right eye and causes unbending burns and scarring to her face.
The 18-year-old said: «I managed in the end, thanks to God, I managed to get away from those disbelievers.
«Even if I had lost both eyes, it would have been merit it, because I have survived them.»