Several churches and parachurch organisations have groups on Facebook (a social networking website). I was just going to suggest it might be nice to have an Affinity group, but apparently there already is one.
http://www.facebook.com
http://www.facebook.com/group.php?gid=2611806069

Facebook allows registered users to add friends - so it could serve to help keep in touch with people. Users can also create groups. Several churches and parachurches have groups on Facebook - many of them probably created by supporters without official permission of the churches/parachurches.

Organisations with groups on Facebook include UCCF, United Beach Missions (an Affinity Associate), and The Free Church of Scotland (an Affinity Corporate Partner).

Facebook has also been used to promote the book Pierced for our transgressions and the New Word Alive event.

The Facebook group now has over 100 members.