The tiny fraction of headlines that news editors push out on Twitter draw a large share of eyeballs, but it is the stories recommended by friends that trigger more clicks, the study found.
In what may be the first independent study of news consumption on social media, researchers at Columbia University and the French Institute for Research in Computer Science and Automation (INRIA) found that reader referrals drove 61 per cent of the nearly 10 million clicks in a random sample of news stories posted on Twitter.
But despite the social web's growing influence, relatively little is known about how people consume news on these proprietary platforms.
Facebook and Twitter, filter and personalise news for users and closely track the results, but because this data is fundamental to their advertising business very little is made public.
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From the one per cent of tweets made public by Twitter, the researchers picked all URLs linked to five news outlets - BBC, Huffington Post, CNN, New York Times and Fox - during a one-month period last summer.
Though far more readers viewed the links news outlets promoted directly on Twitter, the study found that most of what readers shared and read was crowd-curated.
Their results also suggest that people are quicker to share, than read, news discovered on Twitter.
"People are more willing to share an article than read it," said Arnaud Legout, a research scientist at inria.
For those willing to read, the study finds that stories on Twitter have a relatively long shelf life.
While more than 90 per cent of links in the study were shared within a few hours, most links were clicked on, and presumably read, much later; 70 per cent of clicks happened after the first hour, and 18 per cent happened in the second week, the study found.
"Our results show that sharing content and actually reading it are poorly correlated," said Legout.