Thanx for advice:) but between you and me - will be mach more handy if closed and secret groups posts will be visible in Site Feed for groups members, like in FB and OK feeds. Note that Secret group nobody can find and ask to join, unlike Closed one. 

My strong believe is that better way - to create more convenient code than to explain how to live with inconvenient one. 

I agree that developer can't be customers yes-man, at the same time there are lot of wide conventions in social networking and no need to invent something different. Our customers use FB, OK and others, let's use thees conventions in Boonex products, we all can just profit.

Sincerely yours

vavilon