Why are some tweets more popular than others?

When a Twitter staff member set out to answer that question 10 months ago, he thought the answer would emerge among posts from N.B.A. players, politicians or actors. Instead, he found a mystery: a set of messages that were ricocheting around Twitter, being forwarded and responded to at a rate that was off the charts.

“They were punching way above their weight,” said Robin Sloan, who discovered the anomaly but did not recognize the names behind the tweets.

Joyce Meyer, Max Lucado and Andy Stanley were not well known inside Twitter’s offices. But they had all built loyal ranks of followers well beyond their social networks — they were evangelical Christian leaders whose inspirational messages of God’s love perform about 30 times as well as Twitter messages from pop culture powerhouses like Lady Gaga.

Fifteen percent of adult Internet users in the United States are on Twitter, and about half of those use the network every day, according to a report published this week by the Pew Research Center. But Twitter is always looking for ways to add new users. And so, with this new insight, the company sent a senior executive, Claire Díaz-Ortiz, on a mission: to bring more religious leaders into the Twitter fold.