Blog Post
Great idea! mhock
Some things to consider if your groups are public:
Copying content would be a manual effort and may hinder your SEO, consider linking to the content either in a related content widget, or create a new post that encourages conversation about the content from another hub, this can encourage more seasoned members to help newer members.
More hubs may reduce interaction between customers, new content drives SEO and conversation, consider creating new posts or new forums within a learning hub to encourage seasoned members to provide help for newer members.
If you have new member areas on your website or Social sites, consider linking to the group hubs to invite members in for discussion.
Another consideration is to add a message to your IVR or email to encourage these conversations in the Community.
Hope some of these help! Love the idea!!