Here are three great databases for exploring social issues with pro/con essays, books, articles, websites about social issues.
This database provides relevant, credible information on social issues, science, history, government, and the arts and humanities. Overview provided by ProQuest.
SIRS Knowledge Source database is an excellent starting point for many topics. It contains pro/con information on current and controversial issues. Mostly focused on newspapers and magazines, SIRS also offers access to some journal articles, book excerpts, and video/audio files.
Provides full-text online access to resources on American government, current affairs, history, politics, public policy, and social science data analysis. Overview provided by Sage.