Minister-turned-atheist John Loftus’ blog is called Debunking Christianity.

The Brights’ Network is an Internet community working to enhance civic understanding of a naturalistic worldview (“free of supernatural and mystical elements”) and promote acceptance of those who hold such an outlook. More than 52,000 people in 186 nations have registered with the community, which welcomes “brights of many stripes” — including but not limited to […]

Atheist Nexus is an online community exclusively for nontheists. Nearly 20,000 people have joined the site; find ones in your area by using the search function on the members page. Contact through the website.

Mars Hill Church in Seattle uses its own social network, The City, to keep members of its several campuses connected. Mark Driscoll is pastor.

The Catholic Diocese of San Jose, Calif., uses Facebook and Twitter to stay in touch with local Catholics.

Holy Cross Evangelical Lutheran Church of Fairfield, Ohio, uses Facebook to connect with its members and lists that under the church’s ministries. The church also links to the ELCA’s Imagine Yourself social network. Timothy R. Swanson is reverend.

Temple Beth Kodesh in Boynton Beach, Fla., has a Facebook page administered by Rabbi Michael Simon.

Southwest Christian Church in East Point, Ga., uses its Facebook page for a variety of things, including evangelization.

Shir Chadash is a Conservative synagogue in the New Orleans area with a Facebook page. Its rabbi, Ethan Linden, has a Twitter account.