Confirming receiving the report of prisoner Vishal Singh posting pictures of his and some other jail inmates for past few months, a top district official said, "We are holding a probe."
The official said none will be spared if any irregularities were found with respect to prison security.
Singh was arrested a year ago in a narcotics case.
The ADM said the authorities were also looking into allegations that he chatted on FB with outside friends and this was a serious charge.