The arrested has been identified as Harish Devadiga belonging to Belthangady in Dakshina Kannada district, the police said today.
He was arrested from Pumpwell in the city yesterday and his mobile phone has been seized, they said.
Investigation was progressing and a few more would be arrested in thisconnection, they added.
The girl, the StudentsFederation of India's Dakshina Kannada district leader, had filed a complaint with the city police commissioner on January 9 stating that a picture showing her in the company of fellow SFI members, including onefrom another community, was being circulated with malicious intentions.