I (think) I'm a member of the ideas group, and there's been some new stuff posted there, and I haven't gotten any notification of those changes.
Is there a way to get notifications for activity in this group?
Unfortunately notification is for ideas is not available in our current version. We have raised that to the vendor as an enhancement request. Now to be completely transparent, the "idea' functionality is new within the platform and is definitely missing notifications as well as a few other things such as the ability for us to customize ideas statuses which as also been raised to the vendor.
Be assured we are pushing as hard as we can with the vendor.