Some categories of topics that I have seen on Facebook
Abortion
Property Rights
Human Rights
Immigration
Vaccination
Selfishness vs Compassion
Privacy
Children's Rights and their status
God, the Bible, Koran, other religious texts
Celibacy of Priests and Women Religious
Women's Rights
Animal Rights
Intelligent Design vs Evolution
Managed Economies (Socialism, Communism) vs. Price Coordinated (Capitalist) Economies
Minimum Wage Laws
I'll try to update as I think of more. Or some suggestions?
