The LinkedIn "Group" functionality has been broken for a long time with no resolution in sight. I'd been planing to host a private group on LinkedIn for threaded conversations.  The total number of uses is less than 500.

My threaded dicussions needs are relatively simple...don't need elaborate, mutli-layer category hierarchy etc.   An important feature would be not requiring my guest/invitees to create another set of login credentials.  This means letting them authenticate using FB, or Google or MS or.....etc.

What options might I have using one or more Zoho applications to create this functionality without a lot of custom coding?