Happy 5th birthday to the one of the top three social networking sites in the world. Five years ago today, the first tweet ever was sent by co-founder Jack Dorsey. That legendary first tweet read ‘Inviting coworkers’. Since that fateful day, Twitter has achieved insane success, with current tweets in excess of one billion tweets per week. Twitter employs over 400 people, and approximately 460,000 new Twitter accounts are created every day. The website is currently valued at $4 billion.
The original project code name for the service was twttr, with this as it's original logo:
Since then the company has seen two logos, the most recent being implemented last year.