I drop a comment when I especially enjoy a post on a site or I have something to valuable to contribute to the conversation. Usually it's caused by the fire displayed in the post I read.
And after this post andreas-stieniczka.de. I was excited enough to post a thought

I actually do have a couple of questions for you if you don't mind. Is it simply me or does it look as if like a few of the responses come across like coming from brain dead folks?
:-P And, if you are posting on other social sites, I'd like to follow you. Would you list all of your social pages like your Facebook page, twitter feed, or linkedin profile?