Police say as the summer and festive season approaches public disorder will not be tolerated and they will be monitoring Facebook and other sites to prevent events being organised online.
The warning comes after an incident in Castor Bay on Auckland's North Shore on Saturday night.
Team Policing Units and frontline staff including the Eagle helicopter were brought in to the affluent North Shore suburb after several calls from residents about youths drinking and setting off fireworks. The area of Castor Bay is subject to a liquor ban.
Acting North Shore Police Commander Inspector Steve Kehoe says everyone has the right to use public spaces, but police ask that this use be in keeping with the nature and atmosphere of that space.
"Social networking websites appear to be a common medium used to coordinate gatherings of this nature and police will continue to monitor these sites. I advise anyone who is planning festive celebrations to contact police so their event can be registered and monitored.
He said police will not tolerate the kind of behavior and public disorder seen on Saturday night.
Police put up road blocks to disperse the youths and about 130 were split up and directed up two different streets. They say some of the smaller groups began throwing missiles and two officers were struck, but uninjured because of their protective gear.
Some real estate signs were also damaged in the nearby suburb of Milford. One youth was seen jumping on a vehicle and later arrested.
Yesterday a Castor Bay resident told ONE News that he had told police of the Facebook event around 8.30pm, but they didn't deal with the situation until around 10pm, when it was already out of hand.