"Causes" is the best way to keep yourself up to date with many of today's prominent political and social struggles. Starting with the ones found on Change.org, "Causes" currently includes daily posts on:

Animal Rights, Autism, Criminal Justice, Education, Gay Rights, Genocide, Global Health, Global Warming, Homelessness, Human Trafficking, Humanitarian Relief, Immigration, Peace in the Middle East, Poverty in America, Social Entrepreneurship, Sustainable Food, Universal Health Care, and Women's Rights.