Mounties in two Vancouver suburbs say that teen parties in their cities spiralled out of control over the long weekend, and they're linking the problem to social networking.

North Vancouver RCMP say that they were called to respond to 19 separate incidents related to an annual back-to-school party called "Grad Camp-Out" held Monday night at the north end of Mountain Highway near the Floppy Bunny trail.

Police handed out 30 violation tickets to underage kids caught with alcohol, and Cpl. Peter DeVries told ctvbc.ca that numerous criminal investigations are underway for reported sexual assaults, fights, assault with a weapon, drug possession and mischief.

Paramedics also had to be called to take care of several teens, including one who was so drunk he couldn't be roused. Firefighters extinguished a large bonfire said to be lit by the teens -- despite a year-round fire ban.

"Teens drinking and having out of control parties is not anything new to the police, but having them organized like this is," DeVries said. Between 50 and 100 kids from various North Vancouver schools attended the party.

"The change in the way teens socialize and communicate has probably played a part in the way these parties come together," he added, pointing out that websites like Facebook can sometimes lead to ballooning guest lists for teen parties.

Similar Monday-night "Grad Camp-Out" Facebook event pages advertised parties for students at Pemberton Secondary School in Pemberton and Semiahmoo Secondary School in White Rock.

"They camp out overnight and then they go straight to school in the morning after the party," DeVries explained.

He said that parents need to play a more active role in their kids' lives.

"This is a great example of the direct damage that's caused when teens don't have the kind of good decision-making that comes from involved oversight from parents," DeVries said.

As for punishment, he suggests taking away the very technologies that allowed the teens to plan the party in the first place.

"A violation ticket for liquor consumption, that might not get to court for two years, doesn't speak that loudly. Having their cell phone taken away for two weeks does," he said.

Langley Sweet 16 gets out of hand

Police in Langley say they were also forced to deal with a rowdy, drunken teen party over the weekend.

When RCMP officers arrived at a 16-year-old's birthday party at Willoughby Hall on 208 Street on Friday, they found a crowd of about 80 young people and about three-quarters appeared to be drunk.

A handful of drunken teens were found passed out behind the hall. "Luckily, no one suffered from alcohol poisoning," Cpl. Holly Marks told ctvbc.ca.

Several more partygoers were loitering outside the hall, and four of them -- aged 17, 22, 25 and 27 -- were arrested for intoxication in a public place.

"What's a 27-year-old doing at a 16-year-old's birthday party?" Marks asked.

The answer, again, could be sites like Facebook, which allow party invitations to quickly spread from "friend" to "friend" -- and teenagers tend to have hundreds of those.

"Parties that are organized on social networking sites can take on a life of their own," Marks said.

"Unfortunately, I think that sometimes parents or the people who choose to host these kinds of events don't necessarily consider the potential for things to go wrong."