Social Explorer This link opens in a new windowSocial Explorer is an online research tool designed to provide quick and easy access to historical census data and demographic information. It creates fast, intuitive, and appealing maps and reports to help users visually analyze and understand demography and social change throughout history. An invaluable repository of information, the site currently includes the entire US Census history from 1790 to 2000, all annual updates from the American Community Survey, and the Religious Congregations and Membership Study from 1980 to 2000.