11/30/2009 05:12 am ET Updated May 25, 2011

Twitter Timeline: Milestones In Twitter's Road To $1 Billion

Twitter didn't become a billion-dollar company last week thanks to any single event or innovation.

It took a combination of small, crucial moments, whopping momentum changers, and assists from others.

Sometimes help came from the strangest places -- like Iran. Twitter wouldn't be where it is now if Mahmoud Ahmadinejad hadn't seemed to steal Iran's elections in June 2009.

When rioters took to Twitter to organize their protests on Tehran's streets, it kept the company in international headlines for weeks on end.

On at least two occasions, help for Twitter came from the gods.