“Cyber-bullying” is triggering widespread litigation and legislation, with everyone from teachers, parents and school districts pursuing legal action over nasty and threatening remarks posted by students on the Web.

In Pennsylvania, a case is on appeal in the Third U.S. Circuit Court of Appeals involving a student who was suspended for 10 days and sent to an alternative school for posting a fake MySpace profile that made derogatory remarks about his principal. A lower court ruled the school violated the student’s free speech rights, so the school appealed last month. Layshack v. Hermitage Area School District, No. 074465.