Where/What is Oldgrounds?
Though it is true that Hitler did in fact create Newgrounds right after inventing the Internet, he built NG (referring to Newground's 53<r37 code name) upon the remains of another short-lived-but-revived website called Ebay. As well, this website was revived by Tom Fulp, but serves a different purpose. It is a website currently used to trade factory-produced pork products such as Oscar Meyer weiners.
So, technically, Ebay is "Oldgrounds."