Key figures: Jack Dorsey (Twitter co-founder and executive chairman), Evan Williams (co-founder and CEO until October 2010), Dick Costolo (CEO from October 2010), Biz Stone (co-founder), @cnnbrk (CNN Breaking News), Al Jazeera
Summary
Throughout 2010, Twitter emerged from a tech-insider platform into a mass-media phenomenon, transforming how news breaks and spreads globally. Founded in March 2006 — Dorsey sent the platform’s first tweet (“just setting up my twttr”) on March 21 — Twitter reached approximately 105 million registered users by April 2010 and about 145 million by September, while daily tweet volume climbed from roughly 50 million at the start of the year to about 90 million by September; users sent an estimated 25 billion tweets over the course of 2010. The platform’s explosive adoption was driven by a confluence of factors: the proliferation of smartphones (particularly the iPhone 3GS and Android devices), the simplicity of 140-character communication, and the platform’s emergence as the de facto real-time global information network during major events.
Twitter’s role in 2010 was crystallized through several high-profile news events. When the Chilean mining rescue unfolded in October — 33 miners trapped 700 meters underground for 69 days at the Copiapó mine — Twitter served as the primary real-time feed for global audiences, bypassing traditional news gatekeepers entirely. The Arab Spring’s opening spark in Tunisia (December 2010) revealed the platform’s capacity to coordinate and amplify protest activity. Commercially, Twitter launched Promoted Tweets in April 2010, its first advertisement product, laying the groundwork for an advertising-based revenue model whose full potential would not be realized until 2012–2014. The year ended with a significant leadership transition that would define Twitter’s next chapter.
Platform Metrics and Growth Trajectory
Twitter’s growth curve in 2010 was among the steepest of any technology platform in history up to that point. Key benchmarks:
- Registered users: approximately 75 million at the start of 2010, growing to about 105 million by April (announced at the Chirp developer conference), roughly 145 million by September, and toward 175 million by year-end (though active user numbers were substantially lower than registered totals — a persistent measurement challenge for the platform)
- Daily tweet volume: roughly 50 million per day in February 2010, about 65 million by June and approximately 90 million by September — some 25 billion tweets over the full year
- New accounts: approximately 300,000 new accounts created per day at peak 2010 growth
- Geographic spread: by 2010 Twitter had significant user bases in Japan, the United Kingdom, and Brazil alongside the United States, with Japanese users accounting for a disproportionately large share of tweet volume relative to their registered-user count
These numbers represented a more than tenfold increase in registered users over the preceding two years. The growth was partly organic — driven by word of mouth and media coverage — and partly structural: Twitter’s open API (application programming interface), which allowed third-party developers to build applications that read and wrote to the platform, created an ecosystem of Twitter clients (TweetDeck, HootSuite, Seesmic) that extended the platform’s reach without requiring direct use of Twitter.com.
Leadership Transition: Williams to Costolo
In October 2010, Twitter underwent a significant internal leadership change. Evan Williams, who had served as CEO since 2008, stepped down and was replaced by Dick Costolo, who had joined Twitter as chief operating officer in September 2009. Costolo had co-founded FeedBurner, the web-feed management provider that Google acquired in 2007, before coming to Twitter. Williams returned to the board and remained an active investor; Jack Dorsey, who had founded the company but been ousted as CEO in 2008, took on the role of executive chairman.
Costolo’s appointment marked a transition from founder-led operational management to professional executive leadership at a critical moment: Twitter was preparing for eventual monetization and possible public markets. His background in advertising technology (FeedBurner had managed publisher ad networks) was directly relevant to the Promoted Tweets product that had launched earlier in 2010. The Dorsey/Williams/Stone/Costolo dynamic — with multiple founders and their successors navigating influence and strategy simultaneously — foreshadowed tensions that would become public in subsequent years.
Promoted Tweets: Building a Business Model
On April 13, 2010, Twitter launched Promoted Tweets — sponsored messages that appeared in search results when users searched for relevant keywords. The first advertiser was Starbucks; early partners also included Virgin America, Best Buy, and Red Bull. Promoted Tweets were designed to appear as regular tweets but labeled with a small “Promoted” designation, a format that Twitter argued was more native and less intrusive than display advertising.
The April 2010 launch was deliberately experimental: Twitter’s official blog described it as an “early look” and emphasized that user experience would be protected by a “resonance” algorithm — Promoted Tweets that users did not engage with would be removed from rotation, regardless of the advertiser’s budget. This self-regulating quality was intended to signal that Twitter’s commercial ambitions would be constrained by platform health considerations.
By year-end 2010, Promoted Tweets had been extended to a Promoted Trends product (allowing advertisers to purchase placement in the trending topics list) and Promoted Accounts (designed to increase follower counts for brands). The full suite established the commercial architecture that would drive Twitter’s revenue through its 2013 IPO and beyond, though monetization remained modest in 2010 relative to Facebook’s advertising business.
Twitter as Real-Time News Infrastructure
The most consequential dimension of Twitter’s 2010 growth was its emergence as the primary channel for breaking news — not just for individuals, but for institutions.
Chilean mining rescue (October 2010): The 69-day vigil at the Copiapó mine after the initial cave-in on August 5 created a sustained, real-time news event that Twitter’s format was uniquely suited to serve. Journalists, mining engineers, family members, and government officials all tweeted status updates in the weeks preceding the rescue, establishing a distributed information flow that no single broadcaster could match. When the rescue capsule “Fénix” began lifting miners to the surface on October 12–13, Twitter traffic surged globally.
WikiLeaks cables (November–December 2010): When WikiLeaks began releasing 251,287 classified U.S. diplomatic cables on November 28, 2010, Twitter served as the primary real-time distribution mechanism for news organizations synthesizing and publishing the contents. The hashtag #cablegate trended globally for days. Twitter’s role in the WikiLeaks episode also raised early questions about the platform’s relationship to press freedom, government surveillance, and the legal obligations of technology intermediaries — questions that would intensify throughout the decade.
Arab Spring prologue (December 2010): Mohamed Bouazizi’s self-immolation on December 17 in Sidi Bouzid, Tunisia, sparked protests that spread rapidly in part because Tunisian activists and journalists used Twitter (alongside Facebook and YouTube) to share footage and coordinate. The platform’s structure — public, real-time, searchable — made it particularly suited to amplifying protest and bypassing state media control.
Institutional Adoption by News Organizations
By 2010, legacy news organizations had moved from experimental Twitter use to strategic deployment. CNN’s @cnnbrk account (CNN Breaking News) had been established in 2007 and became one of the first accounts to reach one million followers, serving as a model for how broadcast outlets could use the platform to distribute headlines at wire-service speed. Al Jazeera English leveraged Twitter’s immediacy to cover the Arab Spring’s prologue in ways that competed directly with Western wire services, establishing a new model of multilateral real-time news competition.
The Associated Press, Reuters, BBC, New York Times, and Washington Post all established Twitter presences in 2009–2010 and integrated tweet publishing into their editorial workflows. This institutionalization of Twitter as news infrastructure — rather than a personal expression tool — accelerated public adoption by lending the platform legitimacy and demonstrated to advertisers that the audience was engaged with high-interest content.
Significance
Twitter’s 2010 growth represented a fundamental shift in how information moves through society, compressing the timeline between event and awareness from hours to minutes or seconds. The platform’s roles in the Chilean mining rescue, the WikiLeaks revelations, and the opening sparks of the Arab Spring demonstrated social media’s capacity to reconfigure the relationship between events, witnesses, and audiences — sometimes dramatically. Economically, Twitter’s launch of Promoted Tweets signaled the viability of native-advertising models based on user engagement rather than display, influencing digital advertising strategy across the industry. The leadership transition to Costolo positioned Twitter for the operational scaling required to sustain its growth and eventually support a public market debut. Culturally, Twitter’s 2010 trajectory normalized direct, unmediated communication from individuals and institutions to mass audiences, a shift with lasting implications for celebrity, politics, and journalism that would define the following decade.