Answer:
Well telling from personal experience, bullying can affect an individual in many ways. The Things that are affected by bullying are:
1) Personality
2) Interests
3) Mood
4) Feelings
5) Mental Health (Obviously)
6) Grades
7) Relationships
The things bullying introduces are:
1) Depression
2) Anger Issues
3) Insecurities
4) Mental Disorders (In rare instances)
Harassment have very similar effects but it is a bit less intense.
I don't have that much info on communities but communities can probably handle bullying and harassment much better than an individual.