Two Frisco middle school students were suspended and several others received warnings after threatening their teacher on Facebook, a social networking Web site.

Someone notified Staley Middle School officials earlier in the week about the menacing comments, said Rick Burnett, the district's executive director of Student Services.

The page, which disappeared by Wednesday, read, "Join now and maybe we can all kill her together" and "We are gonna kill her soon."

It was targeted at a teacher and titled "I hate Mrs" with her name included.

The creator of the page no longer attends the school. Two students were suspended for commenting on the site, and the parents of a handful of others who joined the group received calls at home.

This was the first case of its kind in the district. But the students' actions and subsequent punishment tap into a hazy boundary between the seeming innocence of social networking sites and security concerns in schools.

"If it creates a material disruption, the school has the authority" to discipline, Burnett said. "And certainly something like this would have and did."

But Dana Saffery, whose 11-year-old daughter has a class with the teacher, said preteens still misunderstand that posting to Facebook carries consequences beyond passing an angry note to a friend.

"Everybody saw the word kill and went 'Columbine!' " she said, referring to the 1999 high school shootings that spawned tighter security measures. "This is just how kids are venting their anger. ... It got blown out of proportion."

About 1,400 "I hate Mrs" pages exist on Facebook, some with even more incendiary comments.

Saffery's daughter, Madison, said she ignored the online invitation to join the group.

Facebook "is to communicate with friends and have a good time and take quizzes, not to make groups saying they hate teachers," she said, adding that the teacher is one of her favorites.

The unregulated access of networking sites allows for situations like this, said Staley parent Whitney De La Cruz, who believes the culprits should serve as examples by facing harsher punishment.

De La Cruz, who doesn't allow her middle schoolers to use Facebook, said the blame lies largely on parents in this age of instant accessibility. "They aren't monitoring, and it's scary."