A thirteenth arrest has been made in connection with the naming on Twitter of the victim in footballer Ched Evans' rape case.
A man from Rhyl has been held on suspicion of malicious communication, said North Wales Police.
Earlier, nine people were bailed pending further inquiries after being arrested on Tuesday and questioned on suspicion of malicious communication or under Section 5 of the Sexual Offences Amendments Act.
Three men from the Sheffield area were arrested and released on bail last week.
Sheffield United and Wales striker Evans was jailed for five years at Caernarfon Crown Court on April 20 for raping a 19-year-old woman in a hotel room.
He denied the allegation and plans to appeal against the verdict.
Following the conclusion of the trial, the victim of the rape was allegedly named and subjected to abuse on Twitter and other websites.
A North Wales Police spokesman said: "A man from Rhyl has been arrested this afternoon as part of the investigation by North Wales Police into the naming of a rape victim on social media sites. The man is currently being questioned at St Asaph police station on suspicion of malicious communication."
Detective Sergeant Bob Halford, who is leading the investigation, said further arrests are expected.
He added: "This latest arrest shows our positive attitude and determination to pursue this investigation and more arrests will be made."