Social Justice

I have a few questions:

1. What is "social justice"?
2. Is there a consensus on the definition of social justice?
3. Why should a church seek to address issues of social justice?
4. Why should a church NOT seek to address issues of social justice?
5. Is HIV/AIDS a social justice issue?
6. Is abortion a social justice issue?
7. Is a married couples ministry a social justice issue?
8. Is a singles ministry a social justice issue?
9. Is n education ministry a social justice issue?

Whenever I hear "social justice" in connection to churches, it's always in connection to Black churches and a brother needs to know.