Newgrounds receives 500,000 unique visitors per day.  Newgrounds was started by 30 year old, Tom Fulp and it is the “the original – and still the largest – Flash portal on the web [About page].”  Newgrounds has been running independently since 1995.  Newgrounds collects millions in revenues and Fulp sounds uninterested in selling off.

Newgrounds is based in Glenside, Pennsylvania.  Newgrounds is primarily driven by user-generated Flash content and the front page features 12 movies and 12 games picked out by the Newgrounds staff.  Newgrounds has a popular rating system that helps submitters determine whether their designs will be a hit or not.

Newgrounds has received a lot of media attention, both positive and controversial.  Newgrounds hosted a Teletubbies spoof which resulted in a lawsuit from the BBC.  The Numa Numa dance first appeared on Newgrounds in 2004 and instantly made Gary Brolsma a viral hit. 

Newgrounds is also known for hosting games that revolve around tragic moments in American history.  There is a Flash game called Virginia Tech Shootout and Oklahoma City Escapades.

Information Source:
[1] ValleyWag: Valleywag: News Corp. wants to buy videogame website Newgrounds by Nicholas Carlson