It is a bit annoying, and perhaps there are better ways of solving the trolling problem. In my specific case I wanted to offer my contribute to one post and that's why I registered, just to find that I also have to wait 4 hours and make 5 posts. I already introduced myself and I'm writing this post now, so I guess the next 3 posts will be just stupid because I have no other purpose than joining and contributing in other discussions and meanwhile I'll have to spam to be able to do it. Please find a better solution. Thanks