A selection of memorable moments from our company.

2006

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

2007

• 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.

2009

• 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.

2010

• 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.

2011

• 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.

2012

• 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.

2013

• 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.

2014

• January
  Vine’s first birthday.
• February
  Our second 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.