I see what you mean. I am measuring startup success in potential revenue. I think a startup ceases to be a startup when it becomes a profitable business. Also,

I see what you mean. I am measuring startup success in potential revenue. I think a startup ceases to be a startup when it becomes a profitable business. Also, I wouldn't consider SpaceX to be in the same boat as Twitter, and I assumed we were talking web startups since the Cuil controversy started this. If we were talking tech in general, I agree, something like SpaceX would be preferable over Twitter any day.