London: Around 350 "dangerous prisoners" currently in British jails have been caught taunting people on Facebook to which they logged in through smartphones smuggled inside prisons.
The ministry of justice said that all the prisoners' profiles were closed after a probe but there could be hundreds more who have used the site without the officials knowledge.
Two years ago, a 44-year-old jailed criminal named Colin Gunn was caught using Facebook to threaten his enemies from a high security prison cell, as per the report.
"I will be home one day and I can't wait to look into certain people's eyes and see the fear of me being there. It's good to have an outlet to let you know how I am, some of you will be in for a good slagging and some have let me down badly and will be named and shamed," Gunn wrote over Facebook.
The news has been criticized by social organizations.
"Offenders using Facebook from prison makes a mockery of the idea that they are being punished," said Javed Khan of the Victim Support group.
Jean Taylor, from Families Fighting for Justice, said: "These perpetrators should not be able to have access to mobile phones in prison. They are getting away with torturing their victims. The social networking sites should police this much more closely."