I used nodeXL (http://nodexl.codeplex.com/) to gather the twitter account descriptions (the part underneath the username on a profile) of the followers of the AFA (Atheist Foundation of Australia; @atheistaus). I plugged 2491 follower descriptions into Wordle (http://www.wordle.net), here is the result. I hope people find this as interesting as I do... I will edit later with some possible issues with this data and some possible interpretations. Until then I'd be happy to hear some comments.

and for comparison followers of @ACLobby (Australian Christian Lobby; 715 followers)
