@Mark - I was quite deliberate in my choice of "or" rather than "and".
@Cheese - I think you are right about attracting new Arginistas, and agree that they are much more likely to find a common interest group on FaceBook. (I accidentally came across CA when I was creating my own Le Mans bluffers guide for people I was bringing along).
Unfortunately I do see people getting divided between FB and the Forum. I am not aware of any good integration tools, but confess I have not done a market scan.
Facebook is great for connecting And networking people and multiple interests, checking in and sharing pictures, but not so good for searching or persistence or longevity of ideas through threads or holding reference material.
And there are many people who have resisted the fatuous nature of FaceBook and always will, but there is no doubts about its popularity or pervasiveness, particularly with many organisations using FaceBook credentials for identity. (I do believe that OpenId or Verify (UK govt) which provides a common identity and password credentials will prevail eventually and we will not have different ids for each service we access)
I am also wary of FaceBook. Criminals use FaceBook to harvest information about people for identity fraud, and a FaceBook credentials (login details), in particular ones with lots of rich personal information are of far higher value than say, national insurance numbers or (I am told) credit card numbers.
I do fear that we will become different communities unless we find a way of bridging the Forum and FaceBook.
On the other side, I'm up for a mobile trial.
Aricus