Hiya Mike,
I'd recommend creating a "Group" page in your Facebook account (if you have one). If not, make a Facebook account for yourself, add a Group page for you "club within a club" and then encourage your participants to Join the club. You can limit access to only those who come to your classes, if you wish. That way, everyone can upload shared information, links, photos, etc and you can still publish a newsletter on it, also. As creator and administrator, you have all sorts of options on how to manage the page/group.
I do a running club as a "group" page. You can see it at http://groups.to/southWindRunners if you want to check out an example.
I'm thinking of doing the same thing for those who come to my classes. I just haven't yet.
Peace and Joy...
Doug Edwards
Peace and Joy...
Doug
OldArmy.US