Milestones | About

2006

March
Jack Dorsey’s early sketch of Twitter; he sends the first Tweet on March 21.

March
Twitter breaks through at SXSW Interactive, wins the digital confab’s SXSW Web Award.
April
Twitter is spun off from Obvious Corp. into a separate company, Twitter, Inc., with Delaware incorporation filing on April 19.
August
The hashtag (#), first proposed by user Chris Messina, debuts on Twitter.

January
US Airways plane crash in NYC’s Hudson River is shared on Twitter; the photo is the first from the scene, breaking the news before traditional media knew about it.
September
Dick Costolo joins Twitter as COO.

April
Twitter launches Promoted Tweets.
Twitter announces it will provide an archive of public Tweets to the Library of Congress.
June
Twitter launches Promoted Trends.
October
Twitter launches Promoted Accounts.
Dick Costolo transitions from COO to CEO.

March
Twitter shares milestone numbers for its fifth birthday, including 1 billion Tweets sent per week.
May
Twitter acquires TweetDeck.
June
Twitter teams up with Apple to integrate Twitter into iOS 5.
September
Twitter announces 100 million monthly active users, worldwide.
Twitter allows mobile users to share photos via SMS (MMS).
October
Twitter launches Promoted Tweets in timelines to all Twitter.com users.

February
Twitter announces self-service advertising for small businesses, in partnership with American Express.
June
Twitter announces the new Twitter bird design.
June
Twitter releases its first transparency report.
November
President Obama marked his win with this Tweet, which became the most retweeted.

January
Twitter launches Vine.
August
500 million Tweets are sent per day, or 1 billion every ~2 days.
Twitter users set a new Tweets per second record.
September
Twitter announces IPO filing.
October
Nielsen Twitter TV Rating launches.
Twitter closes the acquisition of MoPub.

January
Vine’s first birthday.
February
Our latest Transparency Report includes two years of data.
March
To celebrate its eighth birthday, Twitter invites you to find your #FirstTweet, or that of anyone else.
This year’s #Oscars Tweets made an unprecedented 3.3 billion impressions, and this Tweet surpassed the previous record to become the most retweeted.
April
Twitter launches new web profiles.
The MoPub Marketplace and Twitter Publisher Network reach over 1 billion mobile devices.
Twitter acquires Gnip.
June
Twitter acquires Nano Media, SnappyTV, TapCommerce.
July
Our new Transparency Report shows a steady increase in global requests for account information, content removal, and copyright takedowns.
Twitter acquires CardSpring.
We are committed to building a business that we are proud of and making inclusiveness a cornerstone of our culture. To that end, we are joining some peer companies by sharing our ethnic and gender diversity data.
August
Twitter launches Promoted Video .
Introducing Twitter Flight School for agencies.
October
Twitter launches Fabric, a modular SDK at its first mobile developer conference, Twitter Flight.
Twitter announces a partnership with IBM.
November
Twitter offers emoji as an open source library.

January
Twitter launches group Direct Messages and mobile video .
Vine celebrates its second birthday.
Twitter acquires ZipDial.
Twitter details ongoing commitment to San Francisco.
Vine Kids launches.
February
Our latest Transparency Report is the sixth in three years.
Why we support net neutrality.
Twitter acquires Niche.
March
Twitter announces the acquisition of Periscope.