Hello guys, I am wondering if xrumer, gsa etc. are useful. I have read that these kind of tools give you a short term blast, but in the long run are very "unhealthy" for a site`s ranking. Furthermore, I also read that these tools actually might hurt more after the Penguine change than they are good for, because of qualitiy of the content reasons and not so much for backlings. So my question is: How to use them properly? Can they work, if so how? How do you use them?