Sorry... I have to disagree... you should be able to show the landing page of ANY group... whether closed or open. Once the user(s) land there when given a link to a landing page for the group.. they can join and ask for acceptance into that group.
As it is... a simple visitor to the site can STILL see the closed groups.. they simply can't be active in them... this is from a not logged in guest visitor to my site.... and EVERY one of these groups is a closed forum.
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There should be the ability to share THIS information via social media and such...nobody is asking for the keys to the kingdom... simply linking to the closed group which is ALREADY visible as a guest should suffice, and if the visitor wants to join the group... they can join the site and then the group itself.
The very "proof in the pudding" is as a guest visitor... you go to that closed group you see this:
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So at least the SAME basic information should be able to be shared to social media.
So please excuse me if I don't buy your explanation. The data is ALREADY there for visitors to the site itself... so it should be NO issue with sharing that same data.