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Chyane Stephenson-Dielhenn, 18, and a 16-year-old girl, held the victim, also 16, hostage in a care home in Dagenham, Essex, for more than eight hours between 4 March and 5 March.

Snaresbrook Crown Court heard how they made her snort a mixture of salt and tea and eat noodles soaked in urine.

The pair also physically attacked the victim; pouring sugar in her ears, burning her with cigarettes after punching her and tying her up.

The pair posted videos of the ordeal online - but instead of raising the alarm, followers just sent suggestions about what they could do to their victim next.

The victim was able to escape when Stephenson-Dilhenn ordered her to have a shower and she made a break for it.

Snaresbrook Crown Court heard the 16-year-old, who cannot be named, had eight previous convictions for crimes including criminal damage, battery, robbery and theft.

Passing sentence the judge Mr Recorder Shaun Murphy said: "The victim is scarred mentally and physically and this has caused her nightmares that still continue."

Stephenson-Dielhenn, of Islington, north London, denied false imprisonment and assault occasioning actual bodily harm but was found guilty following a trial last month.

(Image: Alex Lentati / Evening Standard)

She was jailed for three years.

The 16-year-old admitted false imprisonment and assault occasioning actual bodily harm and was locked up for two-and-a-half years.

Elaine Cousins, from the CPS, said: "This was an unprovoked, cruel and sickening attack on an innocent young girl by people that she considered to be her friends.

“The behaviour displayed was sadistic.

"The prosecution was able to prove its case through video evidence that showed exactly what took place that night.

"Together Stephenson-Dielhenn and her co-defendant egged each other on and took pleasure in controlling, humiliating and degrading the young victim.

"The victim was left understandably terrified and psychologically scarred.

"I would like to commend her for her bravery in reporting this crime and for taking part in the proceedings.

"I hope this conviction provides her with some comfort and makes clear that those who commit such vile acts will be prosecuted."

Daily Star Online revealed earlier this year how gangs were posting videos of knife attacks on Snapchat as part of a sick new stabbing trend.