Paul was all things to all people. With those stats, I do not think we can ignore Facebook. Some churches are starting to concentrate more on their Facebook presence then on their actual website.
There is a lot of functionality and customization that can be done on Facebook pages, can share discussion boards, photos, videos, can setup polls, setup events and ask to register,and link to other sites.
Plus, you can follow other churches, ministers, and ministries to see how they are interacting with their fans and followers.