Carrying on from what Datte has said, the pure size of social media has resulted in cyber bullying being the main form of bullying. It is rarely the physical bullying it used to be, at least in my experience, but much more personal. People often say that the child can just turn off their social media, which I agree with in some aspects, but that is basically giving up; letting the bully change who you are.
With that being said I have been lucky and have never really been bullied in my life. Of course there have been occasional things but those have been one-offs. Even within my school I do not see very much bullying at all; of course that could just speak volumes for the case that the children who are being bullied become isolated and alone. We can all say things like "toughen up" or "they are just over-reacting" but I think we must realise how alone and depressed you must be to seriously consider committing suicide.
Also with what Drifter has been saying, although I believe in standing up for yourself, with cyber bullying it is never generally a sole bully or a few bullies picking on you. It is often just one person starting it and, all of a sudden, the whole of the school is talking about you. So calling a bully out and fighting them is hard when it is large groups of people that are doing the damage.