Revenue Up at Twitter, but Growth Is a Worry - NYTimes.com

Perhaps Twitter's ultimate purpose is to serve as not-for-profit feature/function market research for Facebook

"Wall Street, it appears, is more worried about Twitter’s ability to add users and keep them engaged than about its ability to increase revenues.

In the last two quarters, that has been a problem. Twitter said it had 255 million monthly users globally in March, up 5 percent from 241 million at the end of December, which ended a quarter in which monthly active users rose less than 4 percent."

Revenue Up at Twitter, but Growth Is a Worry - NYTimes.com