No serious attempt to answer the question 'What is hate speech?' would be complete without an exploration of the outer limits of the concept(s). This book critically examines both the ordinary and legal concepts of hate speech, contrasting social media platform content policies with national and international laws.
Not a cyberbullying case, but deals with when schools can discipline students for off campus speech. "In Mahanoy, the United States Supreme Court resolved the conflict, holding that school officials do have authority to discipline students for their off-campus speech in appropriate cases. However, the court limited that authority to compelling situations, and it ruled that the discipline of B.L. for her vulgarity exceeded that authority and violated her First Amendment rights" quote is from the article SCOTUS Gets It Right in 'Mahanoy' With Measured Response to Student Speech
"The Social Media Victims Law Center (SMVLC) works to hold social media companies legally accountable for the harm they inflict on vulnerable users. SMVLC seeks to apply principles of product liability to force social media companies to elevate consumer safety to the forefront of their economic analysis and design safer platforms that protect users from foreseeable harm."
National Conference of State Legislatures - proposed legislation in 2023, what passed and what didn't. Includes age verification and parental consent laws.
Hate Speech Frontiers by 
Hate Speech by 