Twitter’s Costolo Ramps Up Customer Courtship as Growth Slackens

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Kyle Bowes signed up for a Twitter account more than two years ago to keep up with his favorite soccer team. In that time, he’s sent a total of 12 tweets.

Bowes, 21, works just two miles down Market Street from Twitter Inc.’s San Francisco headquarters, where engineers are working to solve the problem he represents: members who don’t actually use the microblogging service’s product, or worse -- people who don’t think they need Twitter at all.