I leave a comment when I especially enjoy a article on a site or if I have something to contribute to the discussion. It's caused by the sincerness communicated in the article I read.
And on this article GM Werkzeugmaschinen. I was excited enough to write a comment

I actually do have 2 questions for you if you tend not to mind. Is it just me or do some of the responses look as if they are left by brain dead individuals? :-P And, if you are writing at additional social sites, I'd like to keep up with you.
Could you list all of your communal pages like your linkedin profile, Facebook page or twitter feed?