why do people cyber bully by didier grossemy

while the incidences of cyber bullying are rapidly increasing, many people still have no idea why do people cyber bully and hence they are literallly in dark when it comes to identifying the intentions of bullies.
didier grossemy, who is the world famous cyber bullying expert, tells that there are  two kinds of people who are likely to bully: those who are popular and those who are on the social fringes.

according to didier grossemy, Popular kids or teens may bully because:
¦They see it as a way to stay popular.
¦Hurting others makes them feel powerful.
http://www.grossemy.com/