A brief history of the social network's rapid rise.

March 2006 -- Twitter co-founder Jack Dorsey, working at a podcasting startup called Odeo, develops Twitter as an in-house messaging service. On March 21 Dorsey publishes the first tweet ever: "just setting up my twttr." Later in 2006 Odeo co-founder Evan Williams creates a new company called Obvious and buys Odeo and all of its assets -- including Twitter -- from investors.

July 2006 -- Twitter is launched to the general public.

April 2007 -- Twitter is spun off into its own company with Jack Dorsey as CEO, Evan Williams as chairman and Biz Stone as creative director.

LONDON, ENGLAND - NOVEMBER 07:  In this photo illustration, the Twitter logo and hashtag ’#Ring!’ is displayed on a mobile device as the
LONDON, ENGLAND - NOVEMBER 07: In this photo illustration, the Twitter logo and hashtag '#Ring!' is displayed on a mobile device as the company announced its initial public offering and debut on the New York Stock Exchange on November 7, 2013 in London, England. Twitter went public on the NYSE opening at USD 26 per share, valuing the company's worth at an estimated USD 18 billion. (Photo by Bethany Clarke/Getty Images) ( Bethany Clarke )

March 2008 -- Twitter has 1.3 million registered users.

October 2008 -- Dorsey steps down as CEO and becomes chairman; co-founder Williams replaces Dorsey.

September 2009 -- The company notches a $100 million funding round that includes Wall Street players T. Rowe Price and Morgan Stanley.

April 2010 -- Twitter has more than 100 million registered users.

October 2010 -- Williams steps down as CEO. Dick Costolo, formerly Twitter's chief operating officer, became CEO.

December 2010 -- Kleiner Perkins Caufield and Byers leads a $200 million venture funding round.

March 2011 -- Dorsey rejoins Twitter as executive chairman, focusing on product development.

August 2011 -- Breaking a record for venture capital deals, Twitter sews up $400 million from Russia's DST Global, which spends another $400 million buying Twitter shares from employees and prior investors.

June 2013 -- Twitter has 218 million monthly active users, up from 151 million a year earlier.

Sept. 12 -- The company uses its own Twitter account to announce it has filed a confidential IPO plan.

Oct. 3 -- SEC filings reveal that Twitter hopes to raise $1 billion in its IPO.

Oct. 15 -- Twitter chooses to list its shares on the New York Stock Exchange rather than the Nasdaq.

Oct. 24 -- Twitter announces the initial public offering could value the company at nearly $11 billion and says it hopes to raise up to $1.4 billion from the IPO, significantly more than it had projected.

Wednesday -- Signaling strong investor interest in its shares, Twitter increases its IPO price above its earlier range, to $26 a share.

Thursday -- Trading in TWTR begins on the New York Stock Exchange; shares close at $44.90.

Source: Thomson Reuters; Crunchbase; Mercury News research