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Creation & First Tweet
Twitter was founded in California, on this date by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams. Dorsey posted the first ever Tweet at 9:50PM. It read, "just setting up my twttr". -
#Hashtags Are In
The hashtag (#) debuts on Twitter for the first time. -
CEO Changes
It is announced that Jack Dorsey is stepping down as CEO, and will be replaced by Evan Williams. -
Space Tweets
NASA astronaut, T.J. Creamer posts the first off-Earth tweet from the International Space Station -
CEO Changes
Evan Williams steps down as CEO, replaced by erstwhile COO, Dick Costolo. -
100M Users
Twitter has reached 100 million users. -
New Twitter
A new Twitter homepage is tested in order to phase out the "old Twitter". -
Twitter's 6th Birthday and 140M Users
Twitter celebrates its 6th birthday, while also announcing they've reached 140 million users and see 340 million tweets per day. -
New Logo
The logo is changed to a slightly modified blue bird. -
200M Users
Twitter has surpassed 200 million active users. -
Politics
Twitter launches a political transparency page, so that people can better engage with policy issues on Twitter. -
330M Users
Twitter is averaging 330 million monthly active users.