The research also found that self-identified religious users are more likely to tweet to members of their own faith than to members of a different one.
The study examined people whose Twitter profiles identified them as Christian, Jewish, Muslim, Buddhist, Hindu and atheist.
While adherents of all six groups studied tweet frequently, atheists - among the smallest populations in the US - are the most prolific, the 'Huffington Post' reported.
"On average, we can say the atheists have more friends, more followers, and they tweet more," said Lu Chen, a doctoral candidate at the Wright State University.
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Subjects were Twitter users who self-identified as religious or atheist in their profiles, and only those who said they lived in the US.
Researchers compared them to a "baseline" group of Twitter users who expressed no religious identification.
A tag cloud of the most commonly tweeted words across all the studied groups were "love," "life," "work" and "happy."
"Human beings are not that different no matter who you believe in," said Chen, who co-authored the study with Ingmar Weber of the Qatar Computing Research Institute and Adam Okulicz-Kozaryn of Rutgers University-Camden.