Cyber crime cell of Hyderabad police yesterday arrested Abdul Majid, a third-year BTech student, a police release said.
Majid allegedly sent abusive or obscene and threatening messages through Facebook and blackmailed many young girls into sending him their nude photos, police said.
"Posing as a teenage girl, Majid created fake profiles on Facebook and chatted with young girls and then threatened them that he would share their personal information with their friends," police said.
Police also seized two mobile phones from him.