jecke8888888

you still have to buy those books, presumably using a cc or at least by showing your face

I think this may be why some groups use it. I have involved myself in many online business groups (real estate, mlm, etc) and they have a good reason to use facebook groups. They are very easy to control what voices are heard. For example to submit a post to one group which you have to pay +$2500 to enter every post has to be approved by the administrator before it's visible.