The document discusses several issues around privacy and oversharing on social networks:
1) It outlines Facebook's history from its founding in 2004 to reaching 500 million users currently and some of the privacy scandals it has faced.
2) It then discusses reasons why people may overshare personal information on social networks, such as to connect with others, facilitate online shopping and bill pay, and attitudes around privacy among younger generations.
3) Examples are given of information commonly overshared like drug and alcohol use that could harm job prospects, as well as cases where oversharing online led to real-world tragic consequences.