When you talk negative about someone you are actuallly driving business to them, I can't tell you how many new fans, followers and paying clients I get that found me in one of those groups. That is why I laugh at all the nonsense out there. I just sit back and watch it all unfold and social media does what social media does.
So if you want to have a succesful business and if you want to attract the right clients a very simple thing you can do is stop being mean online, its as simple as that.