Tank Man — his identity has never been determined — shot to worldwide fame that day for stopping those tanks, hours after they had brutally crushed student-led protests on Beijing's Tiananmen Square. Hundreds — possibly thousands — died in the early-hours protest on June 4, 1989, an event that still remains a forbidden topic in Communist-governed China.

Pictures of Tank Man's courageous efforts and other information about the crackdown are still officially censored in China. But now, 20 years on, modern technology and the wide reach of social networking sites like Facebook are providing curious students with the information they were previously denied.