The New York Times Agency Photos
CIR TWITTER NEWS
Janessa Goldbeck, who works for the Genocide Intervention Network in Washington, checks Twitter lists of people who work in human rights on Wednesday, March 3, 2010. At its best, the social medium is a perpetual, personalized news service about topics of your choosing -- whether health care reform, tech news or the latest episode of "Gossip Girl" -- filtered and served to you by people who care a lot about what you care a lot about. Even the most prolific users say Twitter has become more useful as a way to tap in to the discussions of the day than to broadcast their own thoughts. And once you get pulled in, you might just find you have something to say after all. (Mary F. Calvert/The New York Times)