Yes, I have made a few FB friends. I dispense basic advice to some of the 'write every day' and 'Goodreads is your best shot at getting reviews' variety. I also agreed to act as a English language Beta Reader for another because his premise intrigued me (which takes some doing these days). Last year I went through my Kindle and posted about 80 very basic reviews to various FB groups, most which had few if any reviews.Yeah, with FB groups your milage may vary. I curate where we participate with an iron fist. And so far, we've been making great friends, learning more about the writing community, and finding out how well word-of-mouth really works.
I deal with scammers with an iron fist. I don't play.