I don't call Facebook a startup. They were once, but they're an established company now. Once your first product is earning a profit (and I mean your real product, not Reddit T-shirts), you're out of the startup phase.
If foo.com causes enough people to buy foo.com t-shirts to feed you and clothe you, why not consider that "established"? Case in point: the guy who runs http://xkcd.com works on xkcd full time and is entirely supported by the stuff sold through the xkcd store.
