Princess Diana: She showed the world how to use celebrity for good.

The so-called "people's princess" wasn't just beloved by the public. She also entirely changed how people view celebrities, according to British journalist Bidisha Mamata."In the 21st century we completely take it for granted that famous people will also be a U.N. special envoy or that they'll use their privilege to do good," she explains. "Princess Diana invented the idea of the famous person who does good, and she was extremely radical."
Diana used her fame to draw attention to a number of humanitarian issues and philanthropic causes, and at one point was linked to more than 100 charities.

She traversed minefields in Bosnia and Angola to advocate for landmine clearance, visited people with leprosy in Nepal, India and Zimbabwe and opened Britain's first AIDS ward in London - where she famously shook ungloved hands with a patient, challenging the false and once-prevalent assumption that HIV/AIDS could be spread by casual touch.
Diana also made headlines for hugging a young patient while visiting a paediatric AIDS unit in Harlem, New York.