New Trier High School in the Chicago suburbs surveyed students about blocked Web sites after loosening its own Internet filters this year. And in New York City, students and teachers at Middle School 127 in the Bronx sent more than 60 e-mails to the Department of Education to protest a block on personal blogs and social media sites.

These were some of the efforts marking the first Banned Websites Awareness Day, organized by the American Association of School Librarians as an offshoot of Banned Books Week.

Carl Harvey, the association’s president, said that as more schools had embraced online technologies, there had been growing concern over schools that block much of the Internet.

But some school leaders and education advocates have argued that the Internet can be a distraction in the classroom, and that blocking social media is also a way to protect students from bullying and harassment at school.

“I think students should have unfettered access to the library,” said William Fitzhugh, editor of The Concord Review, which publishes history papers written by high school students, adding that many children already spend too much time on the Internet.

Phil Goerner, a Silver Creek librarian, said the focus on banned Web sites encouraged students to wrestle with the thornier issues of censorship. He asked his students to consider whether schools should block sites espousing neo-Nazi or racist ideas. “It makes them think about it in deeper ways than if they were just to say, ‘No, don’t block it,’ ” he said.

Mr. Goerner said he decided to organize the graffiti debate as a reminder to students that censorship takes away a person’s voice or, in this case, online privileges. Silver Creek unblocked many social media sites, including Facebook and Twitter, two years ago after recognizing that they could provide learning opportunities, he said.

Similarly, New Trier High School stopped blocking many sites this year after teachers voiced concerns that the filtering had grown oppressive.

Entire categories of Web sites had been blocked, including those that involved games, violence, weapons, even swimsuits, said Judy Gressel, a librarian. “It just got to the point that it became hard to conduct research,” she said, adding that students could not read sites about, say, military weapons for a history paper.

Deven Black, a librarian at Middle School 127 in the Bronx, also said that filters had blocked a range of useful Web sites. YouTube and personal blogs where educators share resources can have value, he said. “Our job is to teach students the safe use of the Internet. And it’s hard to do that if we can’t get to the sites.”

New Canaan High School, in Connecticut, cut off all access to Facebook, YouTube and Twitter just for the day to show solidarity with schools without access.

“It’s not even lunchtime, and I’m already dying,” said Michael DeMattia, 17, a senior, who carries a laptop to school.

In his Advanced Placement Biology class, where lab groups have created a Facebook thread to collaborate and share data, he could not log in. In honors comparative literature, his classmates were unable to show a YouTube video during a presentation.

The Internet, Michael said, has “made cooperation and collaboration inside and outside of class much better and faster,” adding, “It’s really has become an integral part of education.”

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