Happy Fifth Birthday Twitter!

Today, March 21, 2011 marks the fifth anniversary of the first tweet ever sent. PCWorld has counted five milestones from the past five years, two of them are the most important to me:
1. The role of Twitter in coverage of Iranian elections.
2. Twitter in Tunisia and Egypt which help protesters organizing their protests and finally we unexpectedly saw the demise of authoritarian regimes one after another.

Here is a fascinating video of some important figures telling why twitter is important to them.