Ah, what a great advertisement for the ever-popular social networking site: the police are using it to track down criminals!

BOULDER, Colorado — Detectives used profiles posted on the MySpace social networking website to identify six suspects in a rape and robbery that began when a party turned violent, leaving blood “in almost every room of the house,” officials said.

Six men were arrested in connection with the Feb. 23 rampage, and a seventh suspect was being sought, Detective Ali Bartley said Friday. The victim, whose name was withheld, became acquainted with the suspects through MySpace, authorities said.

The group met for a party. “At some point, the victim was no longer aware of what was happening, and she was sexually assaulted,” Bartley said.

She knew only their first names but their pictures were posted on MySpace. “Primarily, we pulled up her friends list. It helped us identify some of the players,” said Bartley.

This will be fun if and when they start needing to track down dissidents. Between MySpace, Google and Gmail records, and all our blogrolls, they should have a pretty easy time rounding us all up.