Also, a very good org. is Oorah (Partners in Torah, mentioned above, is one of there many programs)
About the CR, most of us don’t really know each other. I honestly can say that I don’t know any current posters. In real life I may know some (though I doubt it) but here I only “know” people from hanging around here. Stay and post! You’ll see, its real fun (and addictive!!)!!!