In order to find this case on Findlaw, just search for it using "J.S. vs...." You can then create a free account. The link to the specific case is: http://caselaw.lp.findlaw.com/data2/pennsylvaniastatecases/supreme/j-111-2001mo.pdf.
This case deals with a middle school student who created a Website with defamatory statements about one of his teachers and his school principle. The site, “Teacher Sux,” was created on his home computer but was accessed at school. When it was discovered, it created a stir at school and the teacher he had mentioned, Ms. Fulmer, suffered from stress-related illnesses. The following summer, the school board expelled the student from school for the Website. The student’s parents sued the school board for their decision. The case made it to the Pennsylvania Supreme Court, which ruled that the Website did in fact cause “a material and substantial disruption of the school environment,” making it not protected under the 1st amendment (even though the speech did not constitute a “true threat”). Because the Website affected the school environment, it did not matter that the student had created it at home.
I am interested in how this precedent-setting case affects students’ postings on social networking sites of today, like Facebook.com and MySpace.com. Although these are log-in only websites, any one may gain access to them and may do so in a school environment. I wonder then if a student has been expelled for comments made on one of these social networking sites. This case brings to the forefront the issues of privacy and rights when it comes to personal postings on the internet, something that is all the more prevalent with the ubiquity of social networking sites in young people. The case illustrates the unique circumstances of a school environment and shows that the 1st amendment is limited in that space (going all the way back to the "Tinker" case which can also be found on FindLaw). What students put on their Facebook profiles or their friend’s wall can affect their standing at their university if it causes a “material and substantial disruption of the school environment” or portrays the student doing illegal activities. These Websites offer students a unique opportunity for self-expression and identity formation, but there is also the danger in the lack of privacy of internet postings.
After doing some research online, I found a case where students were suspended from school for writing offensive and vulgar comments about their teacher on each other's facebook.com walls. The school used the "material and substantial disruption" clause to justify why the students were suspended. Apparently, the comments, though posted on Facebook.com from home, caused a disruption in school. The article can be found at: http://www.fox21.com/Global/story.asp?S=6195724&nav=2KPp.

