Newark mayor uses YouTube to find shooter of 4-year old girl

Last week, Newark Mayor Cory Booker released a YouTube video asking the public to help him find the shooter who fired shots across a neighborhood park and injured a 4-year-old girl in the crossfire.

Within a day of releasing the video, the shooter turned himself in due to public pressure. In his most recent YouTube video, Mayor Booker talks about the role social media played in making the arrest: