Table of Contents

Launch of Twitter

Category: Science & Technology Key figures: Jack Dorsey, Evan Williams, Biz Stone, Noah Glass (co-founders)

Summary

Twitter, the microblogging and social-networking service, was launched publicly on July 15, 2006. It grew out of the San Francisco podcasting company Odeo, which had been founded by Evan Williams and Noah Glass and whose business had been undermined when Apple integrated podcasts into iTunes. During a daylong brainstorming session, Odeo engineer Jack Dorsey proposed a service that would let an individual send a short status update by SMS to a small group of people. Dorsey, Williams, Stone, and Glass developed the prototype, and the first message—”just setting up my twttr”—was posted by Dorsey on March 21, 2006, several months before the public launch.

The service was originally code-named “twttr,” a vowel-less spelling inspired by the five-character length of American SMS short codes and by services such as Flickr; the team later acquired the twitter.com domain and adopted the full name. Built on text-messaging technology, early Twitter allowed users to post updates by sending a message to the short code “40404.” Posts were capped at 140 characters, a limit derived from the 160-character maximum of SMS messages (leaving room for a username), which became one of the platform’s defining constraints. The character limit was raised to 280 in 2017.

Adoption was modest at first, but Twitter gained wider attention at the South by Southwest (SXSW) festival in March 2007, where usage surged and daily tweet volume rose sharply. The service spun out of Odeo and was incorporated as a separate company, growing over the following years into one of the most widely used real-time communication platforms in the world.

Significance

Twitter’s 2006 launch introduced and popularized the “microblog”—a feed of very short, public, real-time messages—and helped define the participatory, user-generated character of the Web 2.0 era that Time magazine recognized later in 2006 by naming “You” its Person of the Year. The platform’s brevity, public-by-default design, and use of features such as hashtags and @-replies reshaped how news, politics, activism, and celebrity culture spread online.

In subsequent years Twitter became a central venue for breaking news and political communication worldwide, illustrating how a small side project conceived within a failing startup could grow into globally significant communications infrastructure. The company was later acquired and rebranded as “X” in 2023, but the service traces its origin to the July 2006 launch.

Sources

• [Twitter launches

  July 15, 2006 — HISTORY](https://www.history.com/this-day-in-history/July-15/twitter-launches)

• History of Twitter — Wikipedia

Related

• Pluto Reclassified as a Dwarf Planet — the year’s other landmark Science & Technology development covered in depth.
• Google Acquires YouTube — Google’s $1.65B acquisition of YouTube in October 2006 was the other defining Web 2.0 milestone of the year.
• Time Names “You” Person of the Year — Twitter’s launch contributed to Time recognizing user-generated content as the year’s defining force.
• See the full Timeline of 2006 and master Index for concurrent events.