"I use Twitter as a newsfeed," said Heidi Moore, U.S. finance and economics editor for The Guardian, who has 36,000 followers and has sent more than 100,000 tweets.
"I'm there really for other people," she said. "I put things out so I [can] see how people respond and what they have to say about news stories, and to get a pulse of what's out there in the crowd. I think, as a journalist, how well you engage with Twitter is an indicator of how curious you are as a journalist."
As a marketer, Melissa Rosenthal Brenner, senior vice president of marketing at the National Basketball Association, said she was skeptical of Twitter initially because of the small number of active users.
"Like anything, I think it takes time," she said. "It's the influencers who are young and urban who embrace trends, and then it slowly percolates to Middle America."
The alignment of media and tech could not be clearer than during a week in which Jeff Bezos bought The Washington Post. Where does Twitter fit into all that?
"I think Twitter's probably the best-positioned major social network, and I kind of see Facebook on a decline, " said Matthew Knell, vice president of social and community at About.com.
"I think what's happening is the youth of the world are starting to fade as their parents join Facebook … and you're seeing this revolution back toward person-to-person or small-group communications."