The accused, identified as Mota Durga Prasad, a B.Pharm graduate, was harassing the victim who is a "feminist and active worker of a political party," the police said in a statement.
Prasad allegedly threatened the woman that he would post her private videos and pictures on various social media platforms and will tarnish her image.
The investigation revealed that Prasad bore a grudge again women in general as a girl had earlier refused to accept his proposal, it said.
Police seized a mobile phone and an internet router from the accused.
The accused was produced before a local court which remanded him in judicial custody.