A man will appear in the Christchurch District Court on Monday charged with offences under the Films, Videos and Publications Classification Act.
The 22-year-old was arrested in the initial stages of Friday's shooting in Christchurch, but he is not being charged in relation to the attack itself.
It appears likely he'll face charges relating to sharing content uploaded by the alleged killer. The livestream video of the mass murder has been classified by the Chief Censor's office as objectionable.
Police at this stage do not believe he was directly involved in the atrocity.
Suspected gunman Brenton Tarrant appeared in court on Saturday, charged with one count of murder. Police say more charges are likely to follow as at least 50 people died in the attack, which was livestreamed onto the internet.
Facebook said on Sunday it had removed 1.5 million copies of the video from its platform.
Another person arrested in the wake of the attack will also face charges "not directly related to Friday's event", police say. It's not clear when they'll appear in court.