In California punishable up to one year in jail or $1,000 fine In Florida doesn't have any criminal sanctions. In Missouri Class A misdemeanor but it becomes Class D felony if the victim is 17 yrs. or younger and if the defendant is 21 or older or has an prior harassment conviction.
There is a lot of websites on how to get help online for cyberbullying like: STOMP out bullying, Online SOS network, SOcial media hotline you can contact your local police department.
Tips on how to prevent cyberbullying: Block the people, don't retaliate or respond, save the evidence, tell the person to stop and reach out for help.