Gregory Clapper is a professor of religion and philosophy at the University of Indianapolis and a National Guard chaplain. His research interests include Christian theology, ethics; philosophy of religion, Christian ethics, Christian spiritual formation, Wesleyan studies and church history.

John Voelz is pastor of Westwinds Community Church in Jackson, Mich. The church has its own social network, called Community W. Congregants are encouraged to tweet about sermons, and a Twitter feed is posted on the church’s website. Voelz also writes a blog popular with church members.

Rabbi Andrea London leads Beth Emet The Free Synagogue of Evanston, Ill., which has a Facebook page.

Craig Strickland is senior pastor of Hope Presbyterian Church in Cordova, Tenn., which bills itself as a “church for the unchurched” and relies on social networking sites such as Facebook and Twitter to provide a sense of community.

Martin L. Cook is the Adm. James B. Stockdale Professor of Professional Military Ethics at the U.S. Naval War College in Newport, R.I.

Terry Ledbetter is pastor of NorthStar Church in Saltillo, Miss., which held a series of 2008 sermons on the subject of Facebook.

Kathleen Carley is a professor of organizational sociology at Carnegie Mellon University in Pittsburgh. Among her areas of study is the use of social networks

Glenn Shuck is an assistant professor in the religion department at Williams College in Williamstown, Mass. He has said that the trend of tweeting and using other social networks during religious services is likely to grow, especially among emerging churches.

The Rev. Nathan D. March created a social network site for Prince of Peace Catholic High School Youth Ministry of Lewiston, Maine, using Ning.com.