The pair, were attacked after meeting two men they had been speaking to on the social networking site.
It is believed the sisters agreed to meet them for a drink and were collected at a bus stop before being taken to an apartment
But after going back with the men – believed to be aged 25 and 30 – things quickly turned violent, Amy told the Irish Independent:
“They started to get aggressive and my sister got up to leave.” One of them pushed her to the ground and started kicking her in the head.” They tied us up with rags and put them on our mouths and just kept laughing and laughing as they beat us up.
“Nicole made a run to the corridor outside and fell on the stairs trying to get away and passed out at the bottom.
“They thought she was dead and started ringing people on the phone and saying they needed to dig holes in the Wicklow mountains as they didn’t know what to do with these girls.” I was so scared” I thought we were going to die, I was full sure they were going to kill us.
“They eventually let us go at about 3pm and said if we went to the guards they would kill us and our family.”
The pair, who are convinced the men drugged them, were released from the apartment before they encountered a motorist who drove them to hospital.