Most posts are strictly informative or full of strong opinions. It's hard to comment such a posts.

That's true, except for others who may have strong opposing opinions; then you can get a good debate going. Although it does tend to discourage those who are too shy to challenge a strong opinion.

Not all posts need to have discussions though. If you have been watching my feed, you would have noticed that I post a weekly place to let others advertise their own posts. It could be considered our own little classified advertising section if enough people began using it as such. It needs to overcome that critical hump where enough people use it to make others want to also use it. Without reaching that hump, nobody wants to post there because there aren't enough OTHERS already there! How can one get over the hump if the few that try it drop off before others find it? If you and your followers all consistently advertised their posts there, that weekly page could potentially become a central place to advertise and we would be creating our own community right there! Unfortunately, it seems everyone wants to be the creator of their own communities and as such, nobody cares to assist anyone else in building anything.