"We have detained Lilaram Sharma from Alwar on Monday night. He is being interrogated in Jaipur," SHO, Murlipura police station Ramavtar Takhar said.
An FIR was registered against two people -- Sharma and Bhim Singh Golwar -- by a man named Harikishan Saini, who runs a Facebook page.
Saini had alleged that a post regarding the chief minister's visit to Albert hall to review the preparations of a peace march was uploaded on the page on Saturday.
Saini had alleged that the two accused had posted defamatory and objectionable comments against the chief minister. Police said Saini had seen the post on Sunday and lodged a case against them.