A 3D-printed Twitter logo is seen in this picture illustration. (Reuters)
March: Jack Dorsey creates Twitter and publishes the first tweet ever which says, "just setting up my twttr".
July: The microblogging service officially launches on July 15. Later, co-founder Biz Stone explains what Twitter is in a video on YouTube.
October: Dorsey steps down as CEO to assume a "less intensive" role as chairman of the board; co-founder Evan Williams replaces Dorsey.
couple near me at whole foods are discussing Twitter. she thinks it's boring. bitch.— Ev Williams (@ev) March 28, 2008
November: Twitter passes 1 billion tweet mark. It took Twitter two years and three months to get to one billion Tweets.
September: Twitter changes default avatar to a picture of a bird.
Salesforce, Google and other Silicon Valley titans were expected to be the suitors for Twitter's sale bid. (Getty)
October: Twitter passes the 5 billion tweet mark.
January: NASA astronaut T. J. Creamer sends the first unassisted tweet from space aboard the International Space Station.
From orbit: Launch was awesome!! I am feeling great, working hard, & enjoying the magnificent views, the adventure of a lifetime has begun!— Mike Massimino (@Astro_Mike) May 12, 2009
September: Twitter begins rolling out the new Twitter.com web interface, adding new ways to embed multimedia into the stream. Twitter changes the default avatar picture to a drawing of an egg.
October: Twitter co-founder Williams steps down as CEO, handing the title over to COO Dick Costolo
April: Twitter introduces a new version of its homepage with a sleeker design and revamped pitch to potential users; expands its Local Trends feature to 70 more cities and countries, and updates its search tool to make it easier to find new people to follow.
Twitter in an alliance with Pac-12 Networks promised to raise the exposure of PAC-12 games, making the events easily available on a service many fans already use. (Getty)
January: Twitter launches Vine, the eminently shareable six-second video clips.
September: Twitter becomes a publicly traded company.
The Twitter logo is displayed on a banner outside the New York Stock Exchange (NYSE) on November 7, 2013 in New York City. (Getty)