I think this is a brilliant idea but would suggest changing the facebook page to a group, rather than a community page.
As a community page everything you post goes public - to all your friends, and friends of friends - and there is no way of stopping it - which is fine, but some people are posting health issues etc that maybe they don't realise is being broadcast.
Also, some people may use their CoTH username in other areas and as anyone can access the weight loss page they may not realise they are giving non-CoTHers this information.
It might be better to make it a group, or better, a secret group so that all the information stays slightly more private.
DoogleBug-- totally think making it a secret group is a great idea. Would you like to do that? I would but I don't know how....
Done. If you friend a 'person' on Facebook called Coth Loseit, she will then give you access to the secret group. That way people can put up photos or health issues or whatever without telling ALL their friends!