Recently I got in touch with two online services which I find most useful.
The first is the ResearcrhGate : at first sight a social network of scientists, is much more than that. It is a draft article repository and a place to post and answer technical questions which are visible worldwide. I guess it will change the way we do science, but maybe I'm exaggerating.
The second service is SciRev : have you ever had an unpleasant experience with a magazine? A manuscript which took too much to review, a badly written reviewer report? Some manuscript which was unfairly rejected? The place to post you complain is scirev. You may also access the service to see the stats of a particular magazine.
So, have fun!