Chicago - *Watch YouTube Video in Our Player on the Left (GRAPHIC CONTENT WARNING)*

It seems to defy the logic of committing crimes in a way to avoid getting caught: Ruffians intentionally recording themselves on video beating and robbing someone, then posting it on YouTube so anyone anywhere can see it, including police.

The latest example of this disturbing but increasingly common phenomenon comes from Chicago, where police Wednesday arrested seven teens who apparently did just that. Their video had gone viral and led to their arrest within just days of the Sunday afternoon attack.

The practice, some experts say, is a modern twist on the age-old human penchant for boasting about one's exploits to impress the community at large and to warn perceived rivals that their group is more powerful than others.

"Medieval warriors putting the heads of their enemies on sticks, scalping and even school yard brawls in the `50s -- they're all ways of displaying that dominance in public," said Pam Rutledge, a Palo Alto, Calif.-based psychologist who heads the Media Psychology Research Center. "These new tools -- the Internet, YouTube -- just let you spread the word much farther."

Throughout the more than three-minute video, the attackers -- many with sweat shirt hoods over their heads and some wearing masks -- are seen yelling at the visibly terrified victim, punching and kicking him in the face with apparent glee as he curled up on the snow-covered ground. Police believe the lone girl involved lured the victim to the alley on the city's South Side.

Posting incriminating material online might also reveal a shaky grasp of how cyberspace works.

"These guys are bragging online without understanding they just provided irrefutable evidence of a crime," she said. "It says something both about their naivetT -- and their stupidity."

Speaking to reporters in Chicago Wednesday, Police Superintendent Garry McCarthy noted that episodes of youth violence ending up in online videos have become more frequent everywhere.

"This is a national epidemic," he said. "It's not something that's particular to Chicago."

The Chicago teens were charged in the beating and robbery of a 17-year-old high school student in an incident that stemmed from a previous dispute last October, police said. Police said the posted video helped to identify the alleged attackers.

One teen was charged as an adult. The rest -- a 15-year-old girl, two 16-year-old boys and three 15-year-old boys -- were cited in juvenile delinquency petitions. All face one count each of robbery and aggravated battery, including the teen who recorded the video.

A striking aspect of the video is just how at ease the attackers seem about being filmed. One even pauses from kicking and punching the victim's face to calmly instruct whoever is holding the camera how to compose the shot. He then walks back and resumes pummeling the boy.

Viewers who posted comments online identified the alleged attackers by name, including 17-year-old Raymond Palomino , who appeared in bond court Wednesday, his head bowed and looking ill-at ease. His bail was set at $100,000. Palomino's face is visible in the video.

Police said the attackers stole shoes, a wallet and $180 in cash from the victim, who was treated at a hospital for a laceration to his lip, bruises and abrasions.

Another website provided an outlet to fan the flames leading up to the attack.

Raymond Palomino's father claimed Sunday's beating followed an after-school attack on Raymond and another boy. Michael Palomino, a Cook County sheriff's deputy, said incendiary comments posted on Facebook after the alleged beating of his son contributed to the situation spiraling out of control.

"They're making it sound like he did everything," Palomino said, speaking to reporters following his son's initial appearance in court Wednesday. "It's just one side of the story."

The sheriff's deputy, who said he turned his son in after seeing the viral video, conceded what his son did was wrong. But he also accused prosecutors of exaggerating his son's role.

McCarthy, the city's top cop, shared the bewilderment of many officials and observers about why the teens saw fit to post the video, thereby incriminating themselves.

But while older Americans may express astonishment that someone behaving badly would take the added step of displaying that behavior online, it doesn't surprise teens who have never known a world without the Internet, said Tim Hwang, president of the 750,000-member National Youth Association.

"There's an impulse with youth today to put everything online, so the fact (this beating) was posted online doesn't itself make it more exceptional," said Hwang, 19.

Since always thinking in terms of cyberspace is second nature to today's youth, it wouldn't immediately strike them as odd that the alleged attackers thought in those terms, too, he added.

The video-recorded attack in Chicago isn't the first to attract attention on the Web. In 2009, footage