How to build a WordPress multisite Portal with sharing content ?

Hi,

Would you please help me on the following :

I’d like to have a website running as a multisite :

1. using subdirectories ;

2. having the first/main site working as a portal that will displays and share content (pages, articles, users, menus…:wink: form other subsites ;

3. using different theme for each subsite ;

4. running a social network on a subsite (first choice : BuddyPress, but why not Mingle ?).

My needs are like on this post :

https://wordpress.org/support/topic/sharing-page-content-across-networked-install

What plugins, and/or which configuration would be the best ?

Thanks.