Both cyberbullying and sexting have a similar base in that one person is giving out information about another person. Whether or note the information is true or not is irrelevant.
Cyberbullying has the same affect as in person bullying, except this form of bullying can reach more people in a shorter amount of time. The effect is much quicker with a cyberbully than a bully who is acting out in person only. The emotional effects to the person being bullied is the same - low self esteem, feeling worthless and emotionally hurt. There are many more far-reaching effects of bullying another person as well.
Sexting can be started by the victim or by another person who is not related to or knows the victim. Sexting is sexual harassment online or through text messages or pictures sent via text. Sexting is harmful to us as a society because it breaks down our moral fabric and community. Sexting pictures of a minor is also considered trafficing child pornography and is punishable by law in most areas.
I have two teenage girls and I have stressed to them to never post a picture online that they wouldn't want the entire world to see. We've talked about college and jobs and how what you post online will get to anyone who wants information about you. If you are asking yourself if its OK to post a picture, then the answer is no and its a bad idea - so don't do it. The implications are so far reaching that you may have to make critical life changes like changing the school you attend to fix the situation.