How can nonprofit groups more effectively use social-media tools to garner attention to their work and spark interaction with their supporters?

During a session for nonprofit chief executives at the National Conference on Volunteering and Service in New York, Jack Dorsey, co-founder of the popular social-networking site Twitter, offered advice to nonprofit groups on how they can use online tools to “humanize” their work.

Listen to excerpts from Mr. Dorsey’s discussion by clicking on the audio player.