Guide to Groups

[codinghorror (Jeff Atwood)]

• if a user tries to follow a link to an opt-in category / topic that they’re not opted in to see, they get an unhelpful error, and no means of opting in.
• the “group page” / “group activity” model has no UX linkage to the accompanying category, and is therefore counter-intuitive

These two seem like things we could improve. Any thoughts @sam?