MediaBistro’s E.B. Boyd has interviewed NPR’s social media strategist Andy Carvin and produced a great case study for how Twitter and Facebook can be used by news organizations to

• report on breaking stories
• use Twitter Lists to provide access to credible sources
• find and vet sources to provide on-the ground insight and analyis
• ask the community for assistance in reporting a story
• use Facebook to collect personal stories to illustrate the news

The main take-away? You have to build up your social media cred over time in order to reap dividends when news breaks.

Read the whole interview at MediaBistro.